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arr\n * @param {Function} fn\n * @param {Object=} self\n * @return {Array}\n * @throw TypeError\n */\n\nmodule.exports = function (arr, fn, self) {\n  if (arr.filter) return arr.filter(fn, self);\n  if (void 0 === arr || null === arr) throw new TypeError();\n  if ('function' != typeof fn) throw new TypeError();\n  var ret = [];\n  for (var i = 0; i < arr.length; i++) {\n    if (!hasOwn.call(arr, i)) continue;\n    var val = arr[i];\n    if (fn.call(self, val, i, arr)) ret.push(val);\n  }\n  return ret;\n};\n\nvar hasOwn = Object.prototype.hasOwnProperty;\n\n},{}],2:[function(require,module,exports){\n/**\n * array-foreach\n *   Array#forEach ponyfill for older browsers\n *   (Ponyfill: A polyfill that doesn't overwrite the native method)\n * \n * https://github.com/twada/array-foreach\n *\n * Copyright (c) 2015-2016 Takuto Wada\n * Licensed under the MIT license.\n *   https://github.com/twada/array-foreach/blob/master/MIT-LICENSE\n */\n'use strict';\n\nmodule.exports = function forEach(ary, callback, thisArg) {\n    if (ary.forEach) {\n        ary.forEach(callback, thisArg);\n        return;\n    }\n    for (var i = 0; i < ary.length; i += 1) {\n        callback.call(thisArg, ary[i], i, ary);\n    }\n};\n\n},{}],3:[function(require,module,exports){\n\"use strict\";\n\n/*\n * classList.js: Cross-browser full element.classList implementation.\n * 1.1.20170427\n *\n * By Eli Grey, http://eligrey.com\n * License: Dedicated to the public domain.\n *   See https://github.com/eligrey/classList.js/blob/master/LICENSE.md\n */\n\n/*global self, document, DOMException */\n\n/*! @source http://purl.eligrey.com/github/classList.js/blob/master/classList.js */\n\nif (\"document\" in window.self) {\n\n\t// Full polyfill for browsers with no classList support\n\t// Including IE < Edge missing SVGElement.classList\n\tif (!(\"classList\" in document.createElement(\"_\")) || document.createElementNS && !(\"classList\" in document.createElementNS(\"http://www.w3.org/2000/svg\", \"g\"))) {\n\n\t\t(function (view) {\n\n\t\t\t\"use strict\";\n\n\t\t\tif (!('Element' in view)) return;\n\n\t\t\tvar classListProp = \"classList\",\n\t\t\t    protoProp = \"prototype\",\n\t\t\t    elemCtrProto = view.Element[protoProp],\n\t\t\t    objCtr = Object,\n\t\t\t    strTrim = String[protoProp].trim || function () {\n\t\t\t\treturn this.replace(/^\\s+|\\s+$/g, \"\");\n\t\t\t},\n\t\t\t    arrIndexOf = Array[protoProp].indexOf || function (item) {\n\t\t\t\tvar i = 0,\n\t\t\t\t    len = this.length;\n\t\t\t\tfor (; i < len; i++) {\n\t\t\t\t\tif (i in this && this[i] === item) {\n\t\t\t\t\t\treturn i;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\treturn -1;\n\t\t\t}\n\t\t\t// Vendors: please allow content code to instantiate DOMExceptions\n\t\t\t,\n\t\t\t    DOMEx = function DOMEx(type, message) {\n\t\t\t\tthis.name = type;\n\t\t\t\tthis.code = DOMException[type];\n\t\t\t\tthis.message = message;\n\t\t\t},\n\t\t\t    checkTokenAndGetIndex = function checkTokenAndGetIndex(classList, token) 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implementations don't allow calling DOMException's toString()\n\t\t\t// on non-DOMExceptions. Error's toString() is sufficient here.\n\t\t\tDOMEx[protoProp] = Error[protoProp];\n\t\t\tclassListProto.item = function (i) {\n\t\t\t\treturn this[i] || null;\n\t\t\t};\n\t\t\tclassListProto.contains = function (token) {\n\t\t\t\ttoken += \"\";\n\t\t\t\treturn checkTokenAndGetIndex(this, token) !== -1;\n\t\t\t};\n\t\t\tclassListProto.add = function () {\n\t\t\t\tvar tokens = arguments,\n\t\t\t\t    i = 0,\n\t\t\t\t    l = tokens.length,\n\t\t\t\t    token,\n\t\t\t\t    updated = false;\n\t\t\t\tdo {\n\t\t\t\t\ttoken = tokens[i] + \"\";\n\t\t\t\t\tif (checkTokenAndGetIndex(this, token) === -1) {\n\t\t\t\t\t\tthis.push(token);\n\t\t\t\t\t\tupdated = true;\n\t\t\t\t\t}\n\t\t\t\t} while (++i < l);\n\n\t\t\t\tif (updated) {\n\t\t\t\t\tthis._updateClassName();\n\t\t\t\t}\n\t\t\t};\n\t\t\tclassListProto.remove = function () {\n\t\t\t\tvar tokens = arguments,\n\t\t\t\t    i = 0,\n\t\t\t\t    l = tokens.length,\n\t\t\t\t    token,\n\t\t\t\t    updated = false,\n\t\t\t\t    index;\n\t\t\t\tdo {\n\t\t\t\t\ttoken = tokens[i] + \"\";\n\t\t\t\t\tindex = checkTokenAndGetIndex(this, token);\n\t\t\t\t\twhile (index !== -1) {\n\t\t\t\t\t\tthis.splice(index, 1);\n\t\t\t\t\t\tupdated = true;\n\t\t\t\t\t\tindex = checkTokenAndGetIndex(this, token);\n\t\t\t\t\t}\n\t\t\t\t} while (++i < l);\n\n\t\t\t\tif (updated) {\n\t\t\t\t\tthis._updateClassName();\n\t\t\t\t}\n\t\t\t};\n\t\t\tclassListProto.toggle = function (token, force) {\n\t\t\t\ttoken += \"\";\n\n\t\t\t\tvar result = this.contains(token),\n\t\t\t\t    method = result ? force !== true && \"remove\" : force !== false && \"add\";\n\n\t\t\t\tif (method) {\n\t\t\t\t\tthis[method](token);\n\t\t\t\t}\n\n\t\t\t\tif (force === true || force === false) {\n\t\t\t\t\treturn force;\n\t\t\t\t} else {\n\t\t\t\t\treturn !result;\n\t\t\t\t}\n\t\t\t};\n\t\t\tclassListProto.toString = function () {\n\t\t\t\treturn this.join(\" \");\n\t\t\t};\n\n\t\t\tif (objCtr.defineProperty) {\n\t\t\t\tvar classListPropDesc = {\n\t\t\t\t\tget: classListGetter,\n\t\t\t\t\tenumerable: true,\n\t\t\t\t\tconfigurable: true\n\t\t\t\t};\n\t\t\t\ttry {\n\t\t\t\t\tobjCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);\n\t\t\t\t} catch (ex) {\n\t\t\t\t\t// IE 8 doesn't support enumerable:true\n\t\t\t\t\t// adding undefined to fight this issue https://github.com/eligrey/classList.js/issues/36\n\t\t\t\t\t// modernie IE8-MSW7 machine has IE8 8.0.6001.18702 and is affected\n\t\t\t\t\tif (ex.number === undefined || ex.number === -0x7FF5EC54) {\n\t\t\t\t\t\tclassListPropDesc.enumerable = false;\n\t\t\t\t\t\tobjCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t} else if (objCtr[protoProp].__defineGetter__) {\n\t\t\t\telemCtrProto.__defineGetter__(classListProp, classListGetter);\n\t\t\t}\n\t\t})(window.self);\n\t}\n\n\t// There is full or partial native classList support, so just check if we need\n\t// to normalize the add/remove and toggle APIs.\n\n\t(function () {\n\t\t\"use strict\";\n\n\t\tvar testElement = document.createElement(\"_\");\n\n\t\ttestElement.classList.add(\"c1\", \"c2\");\n\n\t\t// Polyfill for IE 10/11 and Firefox <26, where classList.add and\n\t\t// classList.remove exist but support only one argument at a time.\n\t\tif (!testElement.classList.contains(\"c2\")) {\n\t\t\tvar createMethod = function createMethod(method) {\n\t\t\t\tvar original = DOMTokenList.prototype[method];\n\n\t\t\t\tDOMTokenList.prototype[method] = function (token) {\n\t\t\t\t\tvar i,\n\t\t\t\t\t    len = arguments.length;\n\n\t\t\t\t\tfor (i = 0; i < len; i++) {\n\t\t\t\t\t\ttoken = arguments[i];\n\t\t\t\t\t\toriginal.call(this, token);\n\t\t\t\t\t}\n\t\t\t\t};\n\t\t\t};\n\t\t\tcreateMethod('add');\n\t\t\tcreateMethod('remove');\n\t\t}\n\n\t\ttestElement.classList.toggle(\"c3\", false);\n\n\t\t// Polyfill for IE 10 and Firefox <24, where classList.toggle does not\n\t\t// support the second argument.\n\t\tif (testElement.classList.contains(\"c3\")) {\n\t\t\tvar _toggle = DOMTokenList.prototype.toggle;\n\n\t\t\tDOMTokenList.prototype.toggle = function (token, force) {\n\t\t\t\tif (1 in arguments && !this.contains(token) === !force) {\n\t\t\t\t\treturn force;\n\t\t\t\t} else {\n\t\t\t\t\treturn _toggle.call(this, token);\n\t\t\t\t}\n\t\t\t};\n\t\t}\n\n\t\ttestElement = null;\n\t})();\n}\n\n},{}],4:[function(require,module,exports){\n'use strict';\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\n/*!\n  * domready (c) Dustin Diaz 2014 - License MIT\n  */\n!function (name, definition) {\n\n  if (typeof module != 'undefined') module.exports = definition();else if (typeof define == 'function' && _typeof(define.amd) == 'object') define(definition);else this[name] = definition();\n}('domready', function () {\n\n  var fns = [],\n      _listener,\n      doc = document,\n      hack = doc.documentElement.doScroll,\n      domContentLoaded = 'DOMContentLoaded',\n      loaded = (hack ? /^loaded|^c/ : /^loaded|^i|^c/).test(doc.readyState);\n\n  if (!loaded) doc.addEventListener(domContentLoaded, _listener = function listener() {\n    doc.removeEventListener(domContentLoaded, _listener);\n    loaded = 1;\n    while (_listener = fns.shift()) {\n      _listener();\n    }\n  });\n\n  return function (fn) {\n    loaded ? setTimeout(fn, 0) : fns.push(fn);\n  };\n});\n\n},{}],5:[function(require,module,exports){\n'use strict';\n\n// <3 Modernizr\n// https://raw.githubusercontent.com/Modernizr/Modernizr/master/feature-detects/dom/dataset.js\n\nfunction useNative() {\n\tvar elem = document.createElement('div');\n\telem.setAttribute('data-a-b', 'c');\n\n\treturn Boolean(elem.dataset && elem.dataset.aB === 'c');\n}\n\nfunction nativeDataset(element) {\n\treturn element.dataset;\n}\n\nmodule.exports = useNative() ? nativeDataset : function (element) {\n\tvar map = {};\n\tvar attributes = element.attributes;\n\n\tfunction getter() {\n\t\treturn this.value;\n\t}\n\n\tfunction setter(name, value) {\n\t\tif (typeof value === 'undefined') {\n\t\t\tthis.removeAttribute(name);\n\t\t} else {\n\t\t\tthis.setAttribute(name, value);\n\t\t}\n\t}\n\n\tfor (var i = 0, j = attributes.length; i < j; i++) {\n\t\tvar attribute = attributes[i];\n\n\t\tif (attribute) {\n\t\t\tvar name = attribute.name;\n\n\t\t\tif (name.indexOf('data-') === 0) {\n\t\t\t\tvar prop = name.slice(5).replace(/-./g, function (u) {\n\t\t\t\t\treturn u.charAt(1).toUpperCase();\n\t\t\t\t});\n\n\t\t\t\tvar value = attribute.value;\n\n\t\t\t\tObject.defineProperty(map, prop, {\n\t\t\t\t\tenumerable: true,\n\t\t\t\t\tget: getter.bind({ value: value || '' }),\n\t\t\t\t\tset: setter.bind(element, name)\n\t\t\t\t});\n\t\t\t}\n\t\t}\n\t}\n\n\treturn map;\n};\n\n},{}],6:[function(require,module,exports){\n'use strict';\n\n// element-closest | CC0-1.0 | github.com/jonathantneal/closest\n\n(function (ElementProto) {\n\tif (typeof ElementProto.matches !== 'function') {\n\t\tElementProto.matches = ElementProto.msMatchesSelector || ElementProto.mozMatchesSelector || ElementProto.webkitMatchesSelector || function matches(selector) {\n\t\t\tvar element = this;\n\t\t\tvar elements = (element.document || element.ownerDocument).querySelectorAll(selector);\n\t\t\tvar index = 0;\n\n\t\t\twhile (elements[index] && elements[index] !== element) {\n\t\t\t\t++index;\n\t\t\t}\n\n\t\t\treturn Boolean(elements[index]);\n\t\t};\n\t}\n\n\tif (typeof ElementProto.closest !== 'function') {\n\t\tElementProto.closest = function closest(selector) {\n\t\t\tvar element = this;\n\n\t\t\twhile (element && element.nodeType === 1) {\n\t\t\t\tif (element.matches(selector)) {\n\t\t\t\t\treturn element;\n\t\t\t\t}\n\n\t\t\t\telement = element.parentNode;\n\t\t\t}\n\n\t\t\treturn null;\n\t\t};\n\t}\n})(window.Element.prototype);\n\n},{}],7:[function(require,module,exports){\n(function (global){\n'use strict';\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\n/**\n * lodash (Custom Build) <https://lodash.com/>\n * Build: `lodash modularize exports=\"npm\" -o ./`\n * Copyright jQuery Foundation and other contributors <https://jquery.org/>\n * Released under MIT license <https://lodash.com/license>\n * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>\n * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors\n */\n\n/** Used as the `TypeError` message for \"Functions\" methods. */\nvar FUNC_ERROR_TEXT = 'Expected a function';\n\n/** Used as references for various `Number` constants. */\nvar NAN = 0 / 0;\n\n/** `Object#toString` result references. */\nvar symbolTag = '[object Symbol]';\n\n/** Used to match leading and trailing whitespace. */\nvar reTrim = /^\\s+|\\s+$/g;\n\n/** Used to detect bad signed hexadecimal string values. */\nvar reIsBadHex = /^[-+]0x[0-9a-f]+$/i;\n\n/** Used to detect binary string values. */\nvar reIsBinary = /^0b[01]+$/i;\n\n/** Used to detect octal string values. */\nvar reIsOctal = /^0o[0-7]+$/i;\n\n/** Built-in method references without a dependency on `root`. */\nvar freeParseInt = parseInt;\n\n/** Detect free variable `global` from Node.js. */\nvar freeGlobal = (typeof global === 'undefined' ? 'undefined' : _typeof(global)) == 'object' && global && global.Object === Object && global;\n\n/** Detect free variable `self`. */\nvar freeSelf = (typeof self === 'undefined' ? 'undefined' : _typeof(self)) == 'object' && self && self.Object === Object && self;\n\n/** Used as a reference to the global object. */\nvar root = freeGlobal || freeSelf || Function('return this')();\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar objectToString = objectProto.toString;\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMax = Math.max,\n    nativeMin = Math.min;\n\n/**\n * Gets the timestamp of the number of milliseconds that have elapsed since\n * the Unix epoch (1 January 1970 00:00:00 UTC).\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Date\n * @returns {number} Returns the timestamp.\n * @example\n *\n * _.defer(function(stamp) {\n *   console.log(_.now() - stamp);\n * }, _.now());\n * // => Logs the number of milliseconds it took for the deferred invocation.\n */\nvar now = function now() {\n  return root.Date.now();\n};\n\n/**\n * Creates a debounced function that delays invoking `func` until after `wait`\n * milliseconds have elapsed since the last time the debounced function was\n * invoked. The debounced function comes with a `cancel` method to cancel\n * delayed `func` invocations and a `flush` method to immediately invoke them.\n * Provide `options` to indicate whether `func` should be invoked on the\n * leading and/or trailing edge of the `wait` timeout. The `func` is invoked\n * with the last arguments provided to the debounced function. Subsequent\n * calls to the debounced function return the result of the last `func`\n * invocation.\n *\n * **Note:** If `leading` and `trailing` options are `true`, `func` is\n * invoked on the trailing edge of the timeout only if the debounced function\n * is invoked more than once during the `wait` timeout.\n *\n * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred\n * until to the next tick, similar to `setTimeout` with a timeout of `0`.\n *\n * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)\n * for details over the differences between `_.debounce` and `_.throttle`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to debounce.\n * @param {number} [wait=0] The number of milliseconds to delay.\n * @param {Object} [options={}] The options object.\n * @param {boolean} [options.leading=false]\n *  Specify invoking on the leading edge of the timeout.\n * @param {number} [options.maxWait]\n *  The maximum time `func` is allowed to be delayed before it's invoked.\n * @param {boolean} [options.trailing=true]\n *  Specify invoking on the trailing edge of the timeout.\n * @returns {Function} Returns the new debounced function.\n * @example\n *\n * // Avoid costly calculations while the window size is in flux.\n * jQuery(window).on('resize', _.debounce(calculateLayout, 150));\n *\n * // Invoke `sendMail` when clicked, debouncing subsequent calls.\n * jQuery(element).on('click', _.debounce(sendMail, 300, {\n *   'leading': true,\n *   'trailing': false\n * }));\n *\n * // Ensure `batchLog` is invoked once after 1 second of debounced calls.\n * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });\n * var source = new EventSource('/stream');\n * jQuery(source).on('message', debounced);\n *\n * // Cancel the trailing debounced invocation.\n * jQuery(window).on('popstate', debounced.cancel);\n */\nfunction debounce(func, wait, options) {\n  var lastArgs,\n      lastThis,\n      maxWait,\n      result,\n      timerId,\n      lastCallTime,\n      lastInvokeTime = 0,\n      leading = false,\n      maxing = false,\n      trailing = true;\n\n  if (typeof func != 'function') {\n    throw new TypeError(FUNC_ERROR_TEXT);\n  }\n  wait = toNumber(wait) || 0;\n  if (isObject(options)) {\n    leading = !!options.leading;\n    maxing = 'maxWait' in options;\n    maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;\n    trailing = 'trailing' in options ? !!options.trailing : trailing;\n  }\n\n  function invokeFunc(time) {\n    var args = lastArgs,\n        thisArg = lastThis;\n\n    lastArgs = lastThis = undefined;\n    lastInvokeTime = time;\n    result = func.apply(thisArg, args);\n    return result;\n  }\n\n  function leadingEdge(time) {\n    // Reset any `maxWait` timer.\n    lastInvokeTime = time;\n    // Start the timer for the trailing edge.\n    timerId = setTimeout(timerExpired, wait);\n    // Invoke the leading edge.\n    return leading ? invokeFunc(time) : result;\n  }\n\n  function remainingWait(time) {\n    var timeSinceLastCall = time - lastCallTime,\n        timeSinceLastInvoke = time - lastInvokeTime,\n        result = wait - timeSinceLastCall;\n\n    return maxing ? nativeMin(result, maxWait - timeSinceLastInvoke) : result;\n  }\n\n  function shouldInvoke(time) {\n    var timeSinceLastCall = time - lastCallTime,\n        timeSinceLastInvoke = time - lastInvokeTime;\n\n    // Either this is the first call, activity has stopped and we're at the\n    // trailing edge, the system time has gone backwards and we're treating\n    // it as the trailing edge, or we've hit the `maxWait` limit.\n    return lastCallTime === undefined || timeSinceLastCall >= wait || timeSinceLastCall < 0 || maxing && timeSinceLastInvoke >= maxWait;\n  }\n\n  function timerExpired() {\n    var time = now();\n    if (shouldInvoke(time)) {\n      return trailingEdge(time);\n    }\n    // Restart the timer.\n    timerId = setTimeout(timerExpired, remainingWait(time));\n  }\n\n  function trailingEdge(time) {\n    timerId = undefined;\n\n    // Only invoke if we have `lastArgs` which means `func` has been\n    // debounced at least once.\n    if (trailing && lastArgs) {\n      return invokeFunc(time);\n    }\n    lastArgs = lastThis = undefined;\n    return result;\n  }\n\n  function cancel() {\n    if (timerId !== undefined) {\n      clearTimeout(timerId);\n    }\n    lastInvokeTime = 0;\n    lastArgs = lastCallTime = lastThis = timerId = undefined;\n  }\n\n  function flush() {\n    return timerId === undefined ? result : trailingEdge(now());\n  }\n\n  function debounced() {\n    var time = now(),\n        isInvoking = shouldInvoke(time);\n\n    lastArgs = arguments;\n    lastThis = this;\n    lastCallTime = time;\n\n    if (isInvoking) {\n      if (timerId === undefined) {\n        return leadingEdge(lastCallTime);\n      }\n      if (maxing) {\n        // Handle invocations in a tight loop.\n        timerId = setTimeout(timerExpired, wait);\n        return invokeFunc(lastCallTime);\n      }\n    }\n    if (timerId === undefined) {\n      timerId = setTimeout(timerExpired, wait);\n    }\n    return result;\n  }\n  debounced.cancel = cancel;\n  debounced.flush = flush;\n  return debounced;\n}\n\n/**\n * Checks if `value` is the\n * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)\n * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an object, else `false`.\n * @example\n *\n * _.isObject({});\n * // => true\n *\n * _.isObject([1, 2, 3]);\n * // => true\n *\n * _.isObject(_.noop);\n * // => true\n *\n * _.isObject(null);\n * // => false\n */\nfunction isObject(value) {\n  var type = typeof value === 'undefined' ? 'undefined' : _typeof(value);\n  return !!value && (type == 'object' || type == 'function');\n}\n\n/**\n * Checks if `value` is object-like. A value is object-like if it's not `null`\n * and has a `typeof` result of \"object\".\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is object-like, else `false`.\n * @example\n *\n * _.isObjectLike({});\n * // => true\n *\n * _.isObjectLike([1, 2, 3]);\n * // => true\n *\n * _.isObjectLike(_.noop);\n * // => false\n *\n * _.isObjectLike(null);\n * // => false\n */\nfunction isObjectLike(value) {\n  return !!value && (typeof value === 'undefined' ? 'undefined' : _typeof(value)) == 'object';\n}\n\n/**\n * Checks if `value` is classified as a `Symbol` primitive or object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.\n * @example\n *\n * _.isSymbol(Symbol.iterator);\n * // => true\n *\n * _.isSymbol('abc');\n * // => false\n */\nfunction isSymbol(value) {\n  return (typeof value === 'undefined' ? 'undefined' : _typeof(value)) == 'symbol' || isObjectLike(value) && objectToString.call(value) == symbolTag;\n}\n\n/**\n * Converts `value` to a number.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to process.\n * @returns {number} Returns the number.\n * @example\n *\n * _.toNumber(3.2);\n * // => 3.2\n *\n * _.toNumber(Number.MIN_VALUE);\n * // => 5e-324\n *\n * _.toNumber(Infinity);\n * // => Infinity\n *\n * _.toNumber('3.2');\n * // => 3.2\n */\nfunction toNumber(value) {\n  if (typeof value == 'number') {\n    return value;\n  }\n  if (isSymbol(value)) {\n    return NAN;\n  }\n  if (isObject(value)) {\n    var other = typeof value.valueOf == 'function' ? value.valueOf() : value;\n    value = isObject(other) ? other + '' : other;\n  }\n  if (typeof value != 'string') {\n    return value === 0 ? value : +value;\n  }\n  value = value.replace(reTrim, '');\n  var isBinary = reIsBinary.test(value);\n  return isBinary || reIsOctal.test(value) ? freeParseInt(value.slice(2), isBinary ? 2 : 8) : reIsBadHex.test(value) ? NAN : +value;\n}\n\nmodule.exports = debounce;\n\n}).call(this,typeof global !== \"undefined\" ? global : typeof self !== \"undefined\" ? self : typeof window !== \"undefined\" ? window : {})\n\n},{}],8:[function(require,module,exports){\n/*\nobject-assign\n(c) Sindre Sorhus\n@license MIT\n*/\n\n'use strict';\n/* eslint-disable no-unused-vars */\n\nvar getOwnPropertySymbols = Object.getOwnPropertySymbols;\nvar hasOwnProperty = Object.prototype.hasOwnProperty;\nvar propIsEnumerable = Object.prototype.propertyIsEnumerable;\n\nfunction toObject(val) {\n\tif (val === null || val === undefined) {\n\t\tthrow new TypeError('Object.assign cannot be called with null or undefined');\n\t}\n\n\treturn Object(val);\n}\n\nfunction shouldUseNative() {\n\ttry {\n\t\tif (!Object.assign) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Detect buggy property enumeration order in older V8 versions.\n\n\t\t// https://bugs.chromium.org/p/v8/issues/detail?id=4118\n\t\tvar test1 = new String('abc'); // eslint-disable-line no-new-wrappers\n\t\ttest1[5] = 'de';\n\t\tif (Object.getOwnPropertyNames(test1)[0] === '5') {\n\t\t\treturn false;\n\t\t}\n\n\t\t// https://bugs.chromium.org/p/v8/issues/detail?id=3056\n\t\tvar test2 = {};\n\t\tfor (var i = 0; i < 10; i++) {\n\t\t\ttest2['_' + String.fromCharCode(i)] = i;\n\t\t}\n\t\tvar order2 = Object.getOwnPropertyNames(test2).map(function (n) {\n\t\t\treturn test2[n];\n\t\t});\n\t\tif (order2.join('') !== '0123456789') {\n\t\t\treturn false;\n\t\t}\n\n\t\t// https://bugs.chromium.org/p/v8/issues/detail?id=3056\n\t\tvar test3 = {};\n\t\t'abcdefghijklmnopqrst'.split('').forEach(function (letter) {\n\t\t\ttest3[letter] = letter;\n\t\t});\n\t\tif (Object.keys(Object.assign({}, test3)).join('') !== 'abcdefghijklmnopqrst') {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t} catch (err) {\n\t\t// We don't expect any of the above to throw, but better to be safe.\n\t\treturn false;\n\t}\n}\n\nmodule.exports = shouldUseNative() ? Object.assign : function (target, source) {\n\tvar from;\n\tvar to = toObject(target);\n\tvar symbols;\n\n\tfor (var s = 1; s < arguments.length; s++) {\n\t\tfrom = Object(arguments[s]);\n\n\t\tfor (var key in from) {\n\t\t\tif (hasOwnProperty.call(from, key)) {\n\t\t\t\tto[key] = from[key];\n\t\t\t}\n\t\t}\n\n\t\tif (getOwnPropertySymbols) {\n\t\t\tsymbols = getOwnPropertySymbols(from);\n\t\t\tfor (var i = 0; i < symbols.length; i++) {\n\t\t\t\tif (propIsEnumerable.call(from, symbols[i])) {\n\t\t\t\t\tto[symbols[i]] = from[symbols[i]];\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\treturn to;\n};\n\n},{}],9:[function(require,module,exports){\n'use strict';\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nvar assign = require('object-assign');\nvar delegate = require('../delegate');\nvar delegateAll = require('../delegateAll');\n\nvar DELEGATE_PATTERN = /^(.+):delegate\\((.+)\\)$/;\nvar SPACE = ' ';\n\nvar getListeners = function getListeners(type, handler) {\n  var match = type.match(DELEGATE_PATTERN);\n  var selector;\n  if (match) {\n    type = match[1];\n    selector = match[2];\n  }\n\n  var options;\n  if ((typeof handler === 'undefined' ? 'undefined' : _typeof(handler)) === 'object') {\n    options = {\n      capture: popKey(handler, 'capture'),\n      passive: popKey(handler, 'passive')\n    };\n  }\n\n  var listener = {\n    selector: selector,\n    delegate: (typeof handler === 'undefined' ? 'undefined' : _typeof(handler)) === 'object' ? delegateAll(handler) : selector ? delegate(selector, handler) : handler,\n    options: options\n  };\n\n  if (type.indexOf(SPACE) > -1) {\n    return type.split(SPACE).map(function (_type) {\n      return assign({ type: _type }, listener);\n    });\n  } else {\n    listener.type = type;\n    return [listener];\n  }\n};\n\nvar popKey = function popKey(obj, key) {\n  var value = obj[key];\n  delete obj[key];\n  return value;\n};\n\nmodule.exports = function behavior(events, props) {\n  var listeners = Object.keys(events).reduce(function (memo, type) {\n    var listeners = getListeners(type, events[type]);\n    return memo.concat(listeners);\n  }, []);\n\n  return assign({\n    add: function addBehavior(element) {\n      listeners.forEach(function (listener) {\n        element.addEventListener(listener.type, listener.delegate, listener.options);\n      });\n    },\n    remove: function removeBehavior(element) {\n      listeners.forEach(function (listener) {\n        element.removeEventListener(listener.type, listener.delegate, listener.options);\n      });\n    }\n  }, props);\n};\n\n},{\"../delegate\":11,\"../delegateAll\":12,\"object-assign\":8}],10:[function(require,module,exports){\n\"use strict\";\n\nmodule.exports = function compose(functions) {\n  return function (e) {\n    return functions.some(function (fn) {\n      return fn.call(this, e) === false;\n    }, this);\n  };\n};\n\n},{}],11:[function(require,module,exports){\n'use strict';\n\n// polyfill Element.prototype.closest\nrequire('element-closest');\n\nmodule.exports = function delegate(selector, fn) {\n  return function delegation(event) {\n    var target = event.target.closest(selector);\n    if (target) {\n      return fn.call(target, event);\n    }\n  };\n};\n\n},{\"element-closest\":6}],12:[function(require,module,exports){\n'use strict';\n\nvar delegate = require('../delegate');\nvar compose = require('../compose');\n\nvar SPLAT = '*';\n\nmodule.exports = function delegateAll(selectors) {\n  var keys = Object.keys(selectors);\n\n  // XXX optimization: if there is only one handler and it applies to\n  // all elements (the \"*\" CSS selector), then just return that\n  // handler\n  if (keys.length === 1 && keys[0] === SPLAT) {\n    return selectors[SPLAT];\n  }\n\n  var delegates = keys.reduce(function (memo, selector) {\n    memo.push(delegate(selector, selectors[selector]));\n    return memo;\n  }, []);\n  return compose(delegates);\n};\n\n},{\"../compose\":10,\"../delegate\":11}],13:[function(require,module,exports){\n\"use strict\";\n\nmodule.exports = function ignore(element, fn) {\n  return function ignorance(e) {\n    if (element !== e.target && !element.contains(e.target)) {\n      return fn.call(this, e);\n    }\n  };\n};\n\n},{}],14:[function(require,module,exports){\n\"use strict\";\n\nmodule.exports = function once(listener, options) {\n  var wrapped = function wrappedOnce(e) {\n    e.currentTarget.removeEventListener(e.type, wrapped, options);\n    return listener.call(this, e);\n  };\n  return wrapped;\n};\n\n},{}],15:[function(require,module,exports){\n'use strict';\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nvar RE_TRIM = /(^\\s+)|(\\s+$)/g;\nvar RE_SPLIT = /\\s+/;\n\nvar trim = String.prototype.trim ? function (str) {\n  return str.trim();\n} : function (str) {\n  return str.replace(RE_TRIM, '');\n};\n\nvar queryById = function queryById(id) {\n  return this.querySelector('[id=\"' + id.replace(/\"/g, '\\\\\"') + '\"]');\n};\n\nmodule.exports = function resolveIds(ids, doc) {\n  if (typeof ids !== 'string') {\n    throw new Error('Expected a string but got ' + (typeof ids === 'undefined' ? 'undefined' : _typeof(ids)));\n  }\n\n  if (!doc) {\n    doc = window.document;\n  }\n\n  var getElementById = doc.getElementById ? doc.getElementById.bind(doc) : queryById.bind(doc);\n\n  ids = trim(ids).split(RE_SPLIT);\n\n  // XXX we can short-circuit here because trimming and splitting a\n  // string of just whitespace produces an array containing a single,\n  // empty string\n  if (ids.length === 1 && ids[0] === '') {\n    return [];\n  }\n\n  return ids.map(function (id) {\n    var el = getElementById(id);\n    if (!el) {\n      throw new Error('no element with id: \"' + id + '\"');\n    }\n    return el;\n  });\n};\n\n},{}],16:[function(require,module,exports){\n'use strict';\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nvar behavior = require('../utils/behavior');\nvar filter = require('array-filter');\nvar forEach = require('array-foreach');\nvar toggle = require('../utils/toggle');\nvar isElementInViewport = require('../utils/is-in-viewport');\n\nvar CLICK = require('../events').CLICK;\nvar PREFIX = require('../config').prefix;\n\n// XXX match .usa-accordion and .usa-accordion-bordered\nvar ACCORDION = '.' + PREFIX + '-accordion, .' + PREFIX + '-accordion-bordered';\nvar BUTTON = '.' + PREFIX + '-accordion-button[aria-controls]';\nvar EXPANDED = 'aria-expanded';\nvar MULTISELECTABLE = 'aria-multiselectable';\n\n/**\n * Toggle a button's \"pressed\" state, optionally providing a target\n * state.\n *\n * @param {HTMLButtonElement} button\n * @param {boolean?} expanded If no state is provided, the current\n * state will be toggled (from false to true, and vice-versa).\n * @return {boolean} the resulting state\n */\nvar toggleButton = function toggleButton(button, expanded) {\n  var accordion = button.closest(ACCORDION);\n  if (!accordion) {\n    throw new Error(BUTTON + ' is missing outer ' + ACCORDION);\n  }\n\n  expanded = toggle(button, expanded);\n  // XXX multiselectable is opt-in, to preserve legacy behavior\n  var multiselectable = accordion.getAttribute(MULTISELECTABLE) === 'true';\n\n  if (expanded && !multiselectable) {\n    forEach(getAccordionButtons(accordion), function (other) {\n      if (other !== button) {\n        toggle(other, false);\n      }\n    });\n  }\n};\n\n/**\n * @param {HTMLButtonElement} button\n * @return {boolean} true\n */\nvar showButton = function showButton(button) {\n  return toggleButton(button, true);\n};\n\n/**\n * @param {HTMLButtonElement} button\n * @return {boolean} false\n */\nvar hideButton = function hideButton(button) {\n  return toggleButton(button, false);\n};\n\n/**\n * Get an Array of button elements belonging directly to the given\n * accordion element.\n * @param {HTMLElement} accordion\n * @return {array<HTMLButtonElement>}\n */\nvar getAccordionButtons = function getAccordionButtons(accordion) {\n  return filter(accordion.querySelectorAll(BUTTON), function (button) {\n    return button.closest(ACCORDION) === accordion;\n  });\n};\n\nvar accordion = behavior(_defineProperty({}, CLICK, _defineProperty({}, BUTTON, function (event) {\n  event.preventDefault();\n  toggleButton(this);\n\n  if (this.getAttribute(EXPANDED) === 'true') {\n    // We were just expanded, but if another accordion was also just\n    // collapsed, we may no longer be in the viewport. This ensures\n    // that we are still visible, so the user isn't confused.\n    if (!isElementInViewport(this)) this.scrollIntoView();\n  }\n})), {\n  init: function init(root) {\n    forEach(root.querySelectorAll(BUTTON), function (button) {\n      var expanded = button.getAttribute(EXPANDED) === 'true';\n      toggleButton(button, expanded);\n    });\n  },\n  ACCORDION: ACCORDION,\n  BUTTON: BUTTON,\n  show: showButton,\n  hide: hideButton,\n  toggle: toggleButton,\n  getButtons: getAccordionButtons\n});\n\n/**\n * TODO: for 2.0, remove everything below this comment and export the\n * behavior directly:\n *\n * module.exports = behavior({...});\n */\nvar Accordion = function Accordion(root) {\n  this.root = root;\n  accordion.on(this.root);\n};\n\n// copy all of the behavior methods and props to Accordion\nvar assign = require('object-assign');\nassign(Accordion, accordion);\n\nAccordion.prototype.show = showButton;\nAccordion.prototype.hide = hideButton;\n\nAccordion.prototype.remove = function () {\n  accordion.off(this.root);\n};\n\nmodule.exports = Accordion;\n\n},{\"../config\":25,\"../events\":26,\"../utils/behavior\":30,\"../utils/is-in-viewport\":31,\"../utils/toggle\":35,\"array-filter\":1,\"array-foreach\":2,\"object-assign\":8}],17:[function(require,module,exports){\n'use strict';\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nvar behavior = require('../utils/behavior');\nvar toggle = require('../utils/toggle');\n\nvar CLICK = require('../events').CLICK;\nvar PREFIX = require('../config').prefix;\n\nvar HEADER = '.' + PREFIX + '-banner-header';\nvar EXPANDED_CLASS = PREFIX + '-banner-header-expanded';\n\nvar toggleBanner = function toggleBanner(event) {\n  event.preventDefault();\n  this.closest(HEADER).classList.toggle(EXPANDED_CLASS);\n  return false;\n};\n\nmodule.exports = behavior(_defineProperty({}, CLICK, _defineProperty({}, HEADER + ' [aria-controls]', toggleBanner)));\n\n},{\"../config\":25,\"../events\":26,\"../utils/behavior\":30,\"../utils/toggle\":35}],18:[function(require,module,exports){\n'use strict';\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nvar accordion = require('./accordion');\nvar behavior = require('../utils/behavior');\nvar debounce = require('lodash.debounce');\nvar forEach = require('array-foreach');\nvar select = require('../utils/select');\n\nvar CLICK = require('../events').CLICK;\nvar PREFIX = require('../config').prefix;\n\nvar HIDDEN = 'hidden';\nvar SCOPE = '.' + PREFIX + '-footer-big';\nvar NAV = SCOPE + ' nav';\nvar BUTTON = NAV + ' .' + PREFIX + '-footer-primary-link';\nvar LIST = NAV + ' ul';\n\nvar HIDE_MAX_WIDTH = 600;\nvar DEBOUNCE_RATE = 180;\n\nvar showPanel = function showPanel() {\n  var list = this.closest(LIST);\n  list.classList.remove(HIDDEN);\n\n  // NB: this *should* always succeed because the button\n  // selector is scoped to \".{prefix}-footer-big nav\"\n  var lists = list.closest(NAV).querySelectorAll('ul');\n\n  forEach(lists, function (el) {\n    if (el !== list) {\n      el.classList.add(HIDDEN);\n    }\n  });\n};\n\nvar resize = debounce(function () {\n  var hidden = window.innerWidth < HIDE_MAX_WIDTH;\n  forEach(select(LIST), function (list) {\n    list.classList.toggle(HIDDEN, hidden);\n  });\n}, DEBOUNCE_RATE);\n\nmodule.exports = behavior(_defineProperty({}, CLICK, _defineProperty({}, BUTTON, showPanel)), {\n  // export for use elsewhere\n  HIDE_MAX_WIDTH: HIDE_MAX_WIDTH,\n  DEBOUNCE_RATE: DEBOUNCE_RATE,\n\n  init: function init(target) {\n    resize();\n    window.addEventListener('resize', resize);\n  },\n\n  teardown: function teardown(target) {\n    window.removeEventListener('resize', resize);\n  }\n});\n\n},{\"../config\":25,\"../events\":26,\"../utils/behavior\":30,\"../utils/select\":32,\"./accordion\":16,\"array-foreach\":2,\"lodash.debounce\":7}],19:[function(require,module,exports){\n'use strict';\n\nmodule.exports = {\n  accordion: require('./accordion'),\n  banner: require('./banner'),\n  footer: require('./footer'),\n  navigation: require('./navigation'),\n  password: require('./password'),\n  search: require('./search'),\n  skipnav: require('./skipnav'),\n  validator: require('./validator')\n};\n\n},{\"./accordion\":16,\"./banner\":17,\"./footer\":18,\"./navigation\":20,\"./password\":21,\"./search\":22,\"./skipnav\":23,\"./validator\":24}],20:[function(require,module,exports){\n'use strict';\n\nvar _CLICK;\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nvar behavior = require('../utils/behavior');\nvar forEach = require('array-foreach');\nvar select = require('../utils/select');\nvar accordion = require('./accordion');\n\nvar CLICK = require('../events').CLICK;\nvar PREFIX = require('../config').prefix;\n\nvar NAV = '.' + PREFIX + '-nav';\nvar NAV_LINKS = NAV + ' a';\nvar OPENERS = '.' + PREFIX + '-menu-btn';\nvar CLOSE_BUTTON = '.' + PREFIX + '-nav-close';\nvar OVERLAY = '.' + PREFIX + '-overlay';\nvar CLOSERS = CLOSE_BUTTON + ', .' + PREFIX + '-overlay';\nvar TOGGLES = [NAV, OVERLAY].join(', ');\n\nvar ACTIVE_CLASS = 'usa-mobile_nav-active';\nvar VISIBLE_CLASS = 'is-visible';\n\nvar isActive = function isActive() {\n  return document.body.classList.contains(ACTIVE_CLASS);\n};\n\nvar toggleNav = function toggleNav(active) {\n  var body = document.body;\n  if (typeof active !== 'boolean') {\n    active = !isActive();\n  }\n  body.classList.toggle(ACTIVE_CLASS, active);\n\n  forEach(select(TOGGLES), function (el) {\n    el.classList.toggle(VISIBLE_CLASS, active);\n  });\n\n  var closeButton = body.querySelector(CLOSE_BUTTON);\n  var menuButton = body.querySelector(OPENERS);\n\n  if (active && closeButton) {\n    // The mobile nav was just activated, so focus on the close button,\n    // which is just before all the nav elements in the tab order.\n    closeButton.focus();\n  } else if (!active && document.activeElement === closeButton && menuButton) {\n    // The mobile nav was just deactivated, and focus was on the close\n    // button, which is no longer visible. We don't want the focus to\n    // disappear into the void, so focus on the menu button if it's\n    // visible (this may have been what the user was just focused on,\n    // if they triggered the mobile nav by mistake).\n    menuButton.focus();\n  }\n\n  return active;\n};\n\nvar resize = function resize() {\n  var closer = document.body.querySelector(CLOSE_BUTTON);\n\n  if (isActive() && closer && closer.getBoundingClientRect().width === 0) {\n    // The mobile nav is active, but the close box isn't visible, which\n    // means the user's viewport has been resized so that it is no longer\n    // in mobile mode. Let's make the page state consistent by\n    // deactivating the mobile nav.\n    toggleNav.call(closer, false);\n  }\n};\n\nvar navigation = behavior(_defineProperty({}, CLICK, (_CLICK = {}, _defineProperty(_CLICK, OPENERS, toggleNav), _defineProperty(_CLICK, CLOSERS, toggleNav), _defineProperty(_CLICK, NAV_LINKS, function () {\n  // A navigation link has been clicked! We want to collapse any\n  // hierarchical navigation UI it's a part of, so that the user\n  // can focus on whatever they've just selected.\n\n  // Some navigation links are inside accordions; when they're\n  // clicked, we want to collapse those accordions.\n  var acc = this.closest(accordion.ACCORDION);\n  if (acc) {\n    accordion.getButtons(acc).forEach(function (btn) {\n      return accordion.hide(btn);\n    });\n  }\n\n  // If the mobile navigation menu is active, we want to hide it.\n  if (isActive()) {\n    toggleNav.call(this, false);\n  }\n}), _CLICK)), {\n  init: function init() {\n    resize();\n    window.addEventListener('resize', resize, false);\n  },\n  teardown: function teardown() {\n    window.removeEventListener('resize', resize, false);\n  }\n});\n\n/**\n * TODO for 2.0, remove this statement and export `navigation` directly:\n *\n * module.exports = behavior({...});\n */\nvar assign = require('object-assign');\nmodule.exports = assign(function (el) {\n  return navigation.on(el);\n}, navigation);\n\n},{\"../config\":25,\"../events\":26,\"../utils/behavior\":30,\"../utils/select\":32,\"./accordion\":16,\"array-foreach\":2,\"object-assign\":8}],21:[function(require,module,exports){\n'use strict';\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nvar behavior = require('../utils/behavior');\nvar toggleFormInput = require('../utils/toggle-form-input');\n\nvar CLICK = require('../events').CLICK;\nvar PREFIX = require('../config').prefix;\n\nvar LINK = '.' + PREFIX + '-show_password, .' + PREFIX + '-show_multipassword';\n\nvar toggle = function toggle(event) {\n  event.preventDefault();\n  toggleFormInput(this);\n};\n\nmodule.exports = behavior(_defineProperty({}, CLICK, _defineProperty({}, LINK, toggle)));\n\n},{\"../config\":25,\"../events\":26,\"../utils/behavior\":30,\"../utils/toggle-form-input\":34}],22:[function(require,module,exports){\n'use strict';\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nvar behavior = require('../utils/behavior');\nvar forEach = require('array-foreach');\nvar ignore = require('receptor/ignore');\nvar select = require('../utils/select');\n\nvar CLICK = require('../events').CLICK;\nvar PREFIX = require('../config').prefix;\n\nvar BUTTON = '.js-search-button';\nvar FORM = '.js-search-form';\nvar INPUT = '[type=search]';\nvar CONTEXT = 'header'; // XXX\nvar VISUALLY_HIDDEN = PREFIX + '-sr-only';\n\nvar lastButton = void 0;\n\nvar showSearch = function showSearch(event) {\n  toggleSearch(this, true);\n  lastButton = this;\n};\n\nvar hideSearch = function hideSearch(event) {\n  toggleSearch(this, false);\n  lastButton = undefined;\n};\n\nvar getForm = function getForm(button) {\n  var context = button.closest(CONTEXT);\n  return context ? context.querySelector(FORM) : document.querySelector(FORM);\n};\n\nvar toggleSearch = function toggleSearch(button, active) {\n  var form = getForm(button);\n  if (!form) {\n    throw new Error('No ' + FORM + ' found for search toggle in ' + CONTEXT + '!');\n  }\n\n  button.hidden = active;\n  form.classList.toggle(VISUALLY_HIDDEN, !active);\n\n  if (active) {\n    var input = form.querySelector(INPUT);\n    if (input) {\n      input.focus();\n    }\n    // when the user clicks _outside_ of the form w/ignore(): hide the\n    // search, then remove the listener\n    var listener = ignore(form, function (e) {\n      if (lastButton) {\n        hideSearch.call(lastButton);\n      }\n      document.body.removeEventListener(CLICK, listener);\n    });\n\n    // Normally we would just run this code without a timeout, but\n    // IE11 and Edge will actually call the listener *immediately* because\n    // they are currently handling this exact type of event, so we'll\n    // make sure the browser is done handling the current click event,\n    // if any, before we attach the listener.\n    setTimeout(function () {\n      document.body.addEventListener(CLICK, listener);\n    }, 0);\n  }\n};\n\nvar search = behavior(_defineProperty({}, CLICK, _defineProperty({}, BUTTON, showSearch)), {\n  init: function init(target) {\n    forEach(select(BUTTON, target), function (button) {\n      toggleSearch(button, false);\n    });\n  },\n  teardown: function teardown(target) {\n    // forget the last button clicked\n    lastButton = undefined;\n  }\n});\n\n/**\n * TODO for 2.0, remove this statement and export `navigation` directly:\n *\n * module.exports = behavior({...});\n */\nvar assign = require('object-assign');\nmodule.exports = assign(function (el) {\n  return search.on(el);\n}, search);\n\n},{\"../config\":25,\"../events\":26,\"../utils/behavior\":30,\"../utils/select\":32,\"array-foreach\":2,\"object-assign\":8,\"receptor/ignore\":13}],23:[function(require,module,exports){\n'use strict';\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nvar behavior = require('../utils/behavior');\nvar once = require('receptor/once');\n\nvar CLICK = require('../events').CLICK;\nvar PREFIX = require('../config').prefix;\nvar LINK = '.' + PREFIX + '-skipnav[href^=\"#\"]';\n\nvar setTabindex = function setTabindex(event) {\n  // NB: we know because of the selector we're delegating to below that the\n  // href already begins with '#'\n  var id = this.getAttribute('href').slice(1);\n  var target = document.getElementById(id);\n  if (target) {\n    target.setAttribute('tabindex', 0);\n    target.addEventListener('blur', once(function (event) {\n      target.setAttribute('tabindex', -1);\n    }));\n  } else {\n    // throw an error?\n  }\n};\n\nmodule.exports = behavior(_defineProperty({}, CLICK, _defineProperty({}, LINK, setTabindex)));\n\n},{\"../config\":25,\"../events\":26,\"../utils/behavior\":30,\"receptor/once\":14}],24:[function(require,module,exports){\n'use strict';\n\nvar behavior = require('../utils/behavior');\nvar validate = require('../utils/validate-input');\nvar debounce = require('lodash.debounce');\n\nvar change = function change(event) {\n  return validate(this);\n};\n\nvar validator = behavior({\n  'keyup change': {\n    'input[data-validation-element]': change\n  }\n});\n\n/**\n * TODO for 2.0, remove this statement and export `navigation` directly:\n *\n * module.exports = behavior({...});\n */\nvar assign = require('object-assign');\nmodule.exports = assign(function (el) {\n  return validator.on(el);\n}, validator);\n\n},{\"../utils/behavior\":30,\"../utils/validate-input\":36,\"lodash.debounce\":7,\"object-assign\":8}],25:[function(require,module,exports){\n'use strict';\n\nmodule.exports = {\n  prefix: 'usa'\n};\n\n},{}],26:[function(require,module,exports){\n'use strict';\n\nmodule.exports = {\n  // This used to be conditionally dependent on whether the\n  // browser supported touch events; if it did, `CLICK` was set to\n  // `touchstart`.  However, this had downsides:\n  //\n  // * It pre-empted mobile browsers' default behavior of detecting\n  //   whether a touch turned into a scroll, thereby preventing\n  //   users from using some of our components as scroll surfaces.\n  //\n  // * Some devices, such as the Microsoft Surface Pro, support *both*\n  //   touch and clicks. This meant the conditional effectively dropped\n  //   support for the user's mouse, frustrating users who preferred\n  //   it on those systems.\n  CLICK: 'click'\n};\n\n},{}],27:[function(require,module,exports){\n'use strict';\n\nvar elproto = window.HTMLElement.prototype;\nvar HIDDEN = 'hidden';\n\nif (!(HIDDEN in elproto)) {\n  Object.defineProperty(elproto, HIDDEN, {\n    get: function get() {\n      return this.hasAttribute(HIDDEN);\n    },\n    set: function set(value) {\n      if (value) {\n        this.setAttribute(HIDDEN, '');\n      } else {\n        this.removeAttribute(HIDDEN);\n      }\n    }\n  });\n}\n\n},{}],28:[function(require,module,exports){\n'use strict';\n// polyfills HTMLElement.prototype.classList and DOMTokenList\n\nrequire('classlist-polyfill');\n// polyfills HTMLElement.prototype.hidden\nrequire('./element-hidden');\n\n},{\"./element-hidden\":27,\"classlist-polyfill\":3}],29:[function(require,module,exports){\n'use strict';\n\nvar domready = require('domready');\n\n/**\n * The 'polyfills' define key ECMAScript 5 methods that may be missing from\n * older browsers, so must be loaded first.\n */\nrequire('./polyfills');\n\nvar uswds = require('./config');\n\nvar components = require('./components');\nuswds.components = components;\n\ndomready(function () {\n  var target = document.body;\n  for (var name in components) {\n    var behavior = components[name];\n    behavior.on(target);\n  }\n});\n\nmodule.exports = uswds;\n\n},{\"./components\":19,\"./config\":25,\"./polyfills\":28,\"domready\":4}],30:[function(require,module,exports){\n'use strict';\n\nvar assign = require('object-assign');\nvar forEach = require('array-foreach');\nvar Behavior = require('receptor/behavior');\n\nvar sequence = function sequence() {\n  var seq = [].slice.call(arguments);\n  return function (target) {\n    var _this = this;\n\n    if (!target) {\n      target = document.body;\n    }\n    forEach(seq, function (method) {\n      if (typeof _this[method] === 'function') {\n        _this[method].call(_this, target);\n      }\n    });\n  };\n};\n\n/**\n * @name behavior\n * @param {object} events\n * @param {object?} props\n * @return {receptor.behavior}\n */\nmodule.exports = function (events, props) {\n  return Behavior(events, assign({\n    on: sequence('init', 'add'),\n    off: sequence('teardown', 'remove')\n  }, props));\n};\n\n},{\"array-foreach\":2,\"object-assign\":8,\"receptor/behavior\":9}],31:[function(require,module,exports){\n\"use strict\";\n\n// https://stackoverflow.com/a/7557433\nfunction isElementInViewport(el) {\n  var win = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : window;\n  var docEl = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : document.documentElement;\n\n  var rect = el.getBoundingClientRect();\n\n  return rect.top >= 0 && rect.left >= 0 && rect.bottom <= (win.innerHeight || docEl.clientHeight) && rect.right <= (win.innerWidth || docEl.clientWidth);\n}\n\nmodule.exports = isElementInViewport;\n\n},{}],32:[function(require,module,exports){\n'use strict';\n\n/**\n * @name isElement\n * @desc returns whether or not the given argument is a DOM element.\n * @param {any} value\n * @return {boolean}\n */\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\nvar isElement = function isElement(value) {\n  return value && (typeof value === 'undefined' ? 'undefined' : _typeof(value)) === 'object' && value.nodeType === 1;\n};\n\n/**\n * @name select\n * @desc selects elements from the DOM by class selector or ID selector.\n * @param {string} selector - The selector to traverse the DOM with.\n * @param {Document|HTMLElement?} context - The context to traverse the DOM\n *   in. If not provided, it defaults to the document.\n * @return {HTMLElement[]} - An array of DOM nodes or an empty array.\n */\nmodule.exports = function select(selector, context) {\n\n  if (typeof selector !== 'string') {\n    return [];\n  }\n\n  if (!context || !isElement(context)) {\n    context = window.document;\n  }\n\n  var selection = context.querySelectorAll(selector);\n  return Array.prototype.slice.call(selection);\n};\n\n},{}],33:[function(require,module,exports){\n'use strict';\n\n/**\n * Flips given INPUT elements between masked (hiding the field value) and unmasked\n * @param {Array.HTMLElement} fields - An array of INPUT elements\n * @param {Boolean} mask - Whether the mask should be applied, hiding the field value\n */\nmodule.exports = function (field, mask) {\n  field.setAttribute('autocapitalize', 'off');\n  field.setAttribute('autocorrect', 'off');\n  field.setAttribute('type', mask ? 'password' : 'text');\n};\n\n},{}],34:[function(require,module,exports){\n'use strict';\n\nvar forEach = require('array-foreach');\nvar resolveIdRefs = require('resolve-id-refs');\nvar select = require('./select');\nvar toggleFieldMask = require('./toggle-field-mask');\n\nvar CONTROLS = 'aria-controls';\nvar PRESSED = 'aria-pressed';\nvar SHOW_ATTR = 'data-show-text';\nvar HIDE_ATTR = 'data-hide-text';\n\n/**\n * Replace the word \"Show\" (or \"show\") with \"Hide\" (or \"hide\") in a string.\n * @param {string} showText\n * @return {strong} hideText\n */\nvar getHideText = function getHideText(showText) {\n  return showText.replace(/\\bShow\\b/i, function (show) {\n    return ('S' === show[0] ? 'H' : 'h') + 'ide';\n  });\n};\n\n/**\n * Component that decorates an HTML element with the ability to toggle the\n * masked state of an input field (like a password) when clicked.\n * The ids of the fields to be masked will be pulled directly from the button's\n * `aria-controls` attribute.\n *\n * @param  {HTMLElement} el    Parent element containing the fields to be masked\n * @return {boolean}\n */\nmodule.exports = function (el) {\n  // this is the *target* state:\n  // * if the element has the attr and it's !== \"true\", pressed is true\n  // * otherwise, pressed is false\n  var pressed = el.hasAttribute(PRESSED) && el.getAttribute(PRESSED) !== 'true';\n\n  var fields = resolveIdRefs(el.getAttribute(CONTROLS));\n  forEach(fields, function (field) {\n    return toggleFieldMask(field, pressed);\n  });\n\n  if (!el.hasAttribute(SHOW_ATTR)) {\n    el.setAttribute(SHOW_ATTR, el.textContent);\n  }\n\n  var showText = el.getAttribute(SHOW_ATTR);\n  var hideText = el.getAttribute(HIDE_ATTR) || getHideText(showText);\n\n  el.textContent = pressed ? showText : hideText;\n  el.setAttribute(PRESSED, pressed);\n  return pressed;\n};\n\n},{\"./select\":32,\"./toggle-field-mask\":33,\"array-foreach\":2,\"resolve-id-refs\":15}],35:[function(require,module,exports){\n'use strict';\n\nvar EXPANDED = 'aria-expanded';\nvar CONTROLS = 'aria-controls';\nvar HIDDEN = 'aria-hidden';\n\nmodule.exports = function (button, expanded) {\n\n  if (typeof expanded !== 'boolean') {\n    expanded = button.getAttribute(EXPANDED) === 'false';\n  }\n  button.setAttribute(EXPANDED, expanded);\n\n  var id = button.getAttribute(CONTROLS);\n  var controls = document.getElementById(id);\n  if (!controls) {\n    throw new Error('No toggle target found with id: \"' + id + '\"');\n  }\n\n  controls.setAttribute(HIDDEN, !expanded);\n  return expanded;\n};\n\n},{}],36:[function(require,module,exports){\n'use strict';\n\nvar dataset = require('elem-dataset');\n\nvar PREFIX = require('../config').prefix;\nvar CHECKED = 'aria-checked';\nvar CHECKED_CLASS = PREFIX + '-checklist-checked';\n\nmodule.exports = function validate(el) {\n  var data = dataset(el);\n  var id = data.validationElement;\n  var checkList = id.charAt(0) === '#' ? document.querySelector(id) : document.getElementById(id);\n\n  if (!checkList) {\n    throw new Error('No validation element found with id: \"' + id + '\"');\n  }\n\n  for (var key in data) {\n    if (key.startsWith('validate')) {\n      var validatorName = key.substr('validate'.length).toLowerCase();\n      var validatorPattern = new RegExp(data[key]);\n      var validatorSelector = '[data-validator=\"' + validatorName + '\"]';\n      var validatorCheckbox = checkList.querySelector(validatorSelector);\n      if (!validatorCheckbox) {\n        throw new Error('No validator checkbox found for: \"' + validatorName + '\"');\n      }\n\n      var checked = validatorPattern.test(el.value);\n      validatorCheckbox.classList.toggle(CHECKED_CLASS, checked);\n      validatorCheckbox.setAttribute(CHECKED, checked);\n    }\n  }\n};\n\n},{\"../config\":25,\"elem-dataset\":5}]},{},[29])\n\n","\n/**\n * Array#filter.\n *\n * @param {Array} arr\n * @param {Function} fn\n * @param {Object=} self\n * @return {Array}\n * @throw TypeError\n */\n\nmodule.exports = function (arr, fn, self) {\n  if (arr.filter) return arr.filter(fn, self);\n  if (void 0 === arr || null === arr) throw new TypeError;\n  if ('function' != typeof fn) throw new TypeError;\n  var ret = [];\n  for (var i = 0; i < arr.length; i++) {\n    if (!hasOwn.call(arr, i)) continue;\n    var val = arr[i];\n    if (fn.call(self, val, i, arr)) ret.push(val);\n  }\n  return ret;\n};\n\nvar hasOwn = Object.prototype.hasOwnProperty;\n","/**\n * array-foreach\n *   Array#forEach ponyfill for older browsers\n *   (Ponyfill: A polyfill that doesn't overwrite the native method)\n * \n * https://github.com/twada/array-foreach\n *\n * Copyright (c) 2015-2016 Takuto Wada\n * Licensed under the MIT license.\n *   https://github.com/twada/array-foreach/blob/master/MIT-LICENSE\n */\n'use strict';\n\nmodule.exports = function forEach (ary, callback, thisArg) {\n    if (ary.forEach) {\n        ary.forEach(callback, thisArg);\n        return;\n    }\n    for (var i = 0; i < ary.length; i+=1) {\n        callback.call(thisArg, ary[i], i, ary);\n    }\n};\n","/*\n * classList.js: Cross-browser full element.classList implementation.\n * 1.1.20170427\n *\n * By Eli Grey, http://eligrey.com\n * License: Dedicated to the public domain.\n *   See https://github.com/eligrey/classList.js/blob/master/LICENSE.md\n */\n\n/*global self, document, DOMException */\n\n/*! @source http://purl.eligrey.com/github/classList.js/blob/master/classList.js */\n\nif (\"document\" in window.self) {\n\n// Full polyfill for browsers with no classList support\n// Including IE < Edge missing SVGElement.classList\nif (!(\"classList\" in document.createElement(\"_\")) \n\t|| document.createElementNS && !(\"classList\" in document.createElementNS(\"http://www.w3.org/2000/svg\",\"g\"))) {\n\n(function (view) {\n\n\"use strict\";\n\nif (!('Element' in view)) return;\n\nvar\n\t  classListProp = \"classList\"\n\t, protoProp = \"prototype\"\n\t, elemCtrProto = view.Element[protoProp]\n\t, objCtr = Object\n\t, strTrim = String[protoProp].trim || function () {\n\t\treturn this.replace(/^\\s+|\\s+$/g, \"\");\n\t}\n\t, arrIndexOf = Array[protoProp].indexOf || function (item) {\n\t\tvar\n\t\t\t  i = 0\n\t\t\t, len = this.length\n\t\t;\n\t\tfor (; i < len; i++) {\n\t\t\tif (i in this && this[i] === item) {\n\t\t\t\treturn i;\n\t\t\t}\n\t\t}\n\t\treturn -1;\n\t}\n\t// Vendors: please allow content code to instantiate DOMExceptions\n\t, DOMEx = function (type, message) {\n\t\tthis.name = type;\n\t\tthis.code = DOMException[type];\n\t\tthis.message = message;\n\t}\n\t, checkTokenAndGetIndex = function (classList, token) {\n\t\tif (token === \"\") {\n\t\t\tthrow new DOMEx(\n\t\t\t\t  \"SYNTAX_ERR\"\n\t\t\t\t, \"An invalid or illegal string was specified\"\n\t\t\t);\n\t\t}\n\t\tif (/\\s/.test(token)) {\n\t\t\tthrow new DOMEx(\n\t\t\t\t  \"INVALID_CHARACTER_ERR\"\n\t\t\t\t, \"String contains an invalid character\"\n\t\t\t);\n\t\t}\n\t\treturn arrIndexOf.call(classList, token);\n\t}\n\t, ClassList = function (elem) {\n\t\tvar\n\t\t\t  trimmedClasses = strTrim.call(elem.getAttribute(\"class\") || \"\")\n\t\t\t, classes = trimmedClasses ? trimmedClasses.split(/\\s+/) : []\n\t\t\t, i = 0\n\t\t\t, len = classes.length\n\t\t;\n\t\tfor (; i < len; i++) {\n\t\t\tthis.push(classes[i]);\n\t\t}\n\t\tthis._updateClassName = function () {\n\t\t\telem.setAttribute(\"class\", this.toString());\n\t\t};\n\t}\n\t, classListProto = ClassList[protoProp] = []\n\t, classListGetter = function () {\n\t\treturn new ClassList(this);\n\t}\n;\n// Most DOMException implementations don't allow calling DOMException's toString()\n// on non-DOMExceptions. Error's toString() is sufficient here.\nDOMEx[protoProp] = Error[protoProp];\nclassListProto.item = function (i) {\n\treturn this[i] || null;\n};\nclassListProto.contains = function (token) {\n\ttoken += \"\";\n\treturn checkTokenAndGetIndex(this, token) !== -1;\n};\nclassListProto.add = function () {\n\tvar\n\t\t  tokens = arguments\n\t\t, i = 0\n\t\t, l = tokens.length\n\t\t, token\n\t\t, updated = false\n\t;\n\tdo {\n\t\ttoken = tokens[i] + \"\";\n\t\tif (checkTokenAndGetIndex(this, token) === -1) {\n\t\t\tthis.push(token);\n\t\t\tupdated = true;\n\t\t}\n\t}\n\twhile (++i < l);\n\n\tif (updated) {\n\t\tthis._updateClassName();\n\t}\n};\nclassListProto.remove = function () {\n\tvar\n\t\t  tokens = arguments\n\t\t, i = 0\n\t\t, l = tokens.length\n\t\t, token\n\t\t, updated = false\n\t\t, index\n\t;\n\tdo {\n\t\ttoken = tokens[i] + \"\";\n\t\tindex = checkTokenAndGetIndex(this, token);\n\t\twhile (index !== -1) {\n\t\t\tthis.splice(index, 1);\n\t\t\tupdated = true;\n\t\t\tindex = checkTokenAndGetIndex(this, token);\n\t\t}\n\t}\n\twhile (++i < l);\n\n\tif (updated) {\n\t\tthis._updateClassName();\n\t}\n};\nclassListProto.toggle = function (token, force) {\n\ttoken += \"\";\n\n\tvar\n\t\t  result = this.contains(token)\n\t\t, method = result ?\n\t\t\tforce !== true && \"remove\"\n\t\t:\n\t\t\tforce !== false && \"add\"\n\t;\n\n\tif (method) {\n\t\tthis[method](token);\n\t}\n\n\tif (force === true || force === false) {\n\t\treturn force;\n\t} else {\n\t\treturn !result;\n\t}\n};\nclassListProto.toString = function () {\n\treturn this.join(\" \");\n};\n\nif (objCtr.defineProperty) {\n\tvar classListPropDesc = {\n\t\t  get: classListGetter\n\t\t, enumerable: true\n\t\t, configurable: true\n\t};\n\ttry {\n\t\tobjCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);\n\t} catch (ex) { // IE 8 doesn't support enumerable:true\n\t\t// adding undefined to fight this issue https://github.com/eligrey/classList.js/issues/36\n\t\t// modernie IE8-MSW7 machine has IE8 8.0.6001.18702 and is affected\n\t\tif (ex.number === undefined || ex.number === -0x7FF5EC54) {\n\t\t\tclassListPropDesc.enumerable = false;\n\t\t\tobjCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);\n\t\t}\n\t}\n} else if (objCtr[protoProp].__defineGetter__) {\n\telemCtrProto.__defineGetter__(classListProp, classListGetter);\n}\n\n}(window.self));\n\n}\n\n// There is full or partial native classList support, so just check if we need\n// to normalize the add/remove and toggle APIs.\n\n(function () {\n\t\"use strict\";\n\n\tvar testElement = document.createElement(\"_\");\n\n\ttestElement.classList.add(\"c1\", \"c2\");\n\n\t// Polyfill for IE 10/11 and Firefox <26, where classList.add and\n\t// classList.remove exist but support only one argument at a time.\n\tif (!testElement.classList.contains(\"c2\")) {\n\t\tvar createMethod = function(method) {\n\t\t\tvar original = DOMTokenList.prototype[method];\n\n\t\t\tDOMTokenList.prototype[method] = function(token) {\n\t\t\t\tvar i, len = arguments.length;\n\n\t\t\t\tfor (i = 0; i < len; i++) {\n\t\t\t\t\ttoken = arguments[i];\n\t\t\t\t\toriginal.call(this, token);\n\t\t\t\t}\n\t\t\t};\n\t\t};\n\t\tcreateMethod('add');\n\t\tcreateMethod('remove');\n\t}\n\n\ttestElement.classList.toggle(\"c3\", false);\n\n\t// Polyfill for IE 10 and Firefox <24, where classList.toggle does not\n\t// support the second argument.\n\tif (testElement.classList.contains(\"c3\")) {\n\t\tvar _toggle = DOMTokenList.prototype.toggle;\n\n\t\tDOMTokenList.prototype.toggle = function(token, force) {\n\t\t\tif (1 in arguments && !this.contains(token) === !force) {\n\t\t\t\treturn force;\n\t\t\t} else {\n\t\t\t\treturn _toggle.call(this, token);\n\t\t\t}\n\t\t};\n\n\t}\n\n\ttestElement = null;\n}());\n\n}\n","/*!\n  * domready (c) Dustin Diaz 2014 - License MIT\n  */\n!function (name, definition) {\n\n  if (typeof module != 'undefined') module.exports = definition()\n  else if (typeof define == 'function' && typeof define.amd == 'object') define(definition)\n  else this[name] = definition()\n\n}('domready', function () {\n\n  var fns = [], listener\n    , doc = document\n    , hack = doc.documentElement.doScroll\n    , domContentLoaded = 'DOMContentLoaded'\n    , loaded = (hack ? /^loaded|^c/ : /^loaded|^i|^c/).test(doc.readyState)\n\n\n  if (!loaded)\n  doc.addEventListener(domContentLoaded, listener = function () {\n    doc.removeEventListener(domContentLoaded, listener)\n    loaded = 1\n    while (listener = fns.shift()) listener()\n  })\n\n  return function (fn) {\n    loaded ? setTimeout(fn, 0) : fns.push(fn)\n  }\n\n});\n","'use strict';\n\n// <3 Modernizr\n// https://raw.githubusercontent.com/Modernizr/Modernizr/master/feature-detects/dom/dataset.js\n\nfunction useNative() {\n\tvar elem = document.createElement('div');\n\telem.setAttribute('data-a-b', 'c');\n\n\treturn Boolean(elem.dataset && elem.dataset.aB === 'c');\n}\n\nfunction nativeDataset(element) {\n\treturn element.dataset;\n}\n\nmodule.exports = useNative() ? nativeDataset : function (element) {\n\tvar map = {};\n\tvar attributes = element.attributes;\n\n\tfunction getter() {\n\t\treturn this.value;\n\t}\n\n\tfunction setter(name, value) {\n\t\tif (typeof value === 'undefined') {\n\t\t\tthis.removeAttribute(name);\n\t\t} else {\n\t\t\tthis.setAttribute(name, value);\n\t\t}\n\t}\n\n\tfor (var i = 0, j = attributes.length; i < j; i++) {\n\t\tvar attribute = attributes[i];\n\n\t\tif (attribute) {\n\t\t\tvar name = attribute.name;\n\n\t\t\tif (name.indexOf('data-') === 0) {\n\t\t\t\tvar prop = name.slice(5).replace(/-./g, function (u) {\n\t\t\t\t\treturn u.charAt(1).toUpperCase();\n\t\t\t\t});\n\n\t\t\t\tvar value = attribute.value;\n\n\t\t\t\tObject.defineProperty(map, prop, {\n\t\t\t\t\tenumerable: true,\n\t\t\t\t\tget: getter.bind({ value: value || '' }),\n\t\t\t\t\tset: setter.bind(element, name)\n\t\t\t\t});\n\t\t\t}\n\t\t}\n\t}\n\n\treturn map;\n};\n\n","// element-closest | CC0-1.0 | github.com/jonathantneal/closest\n\n(function (ElementProto) {\n\tif (typeof ElementProto.matches !== 'function') {\n\t\tElementProto.matches = ElementProto.msMatchesSelector || ElementProto.mozMatchesSelector || ElementProto.webkitMatchesSelector || function matches(selector) {\n\t\t\tvar element = this;\n\t\t\tvar elements = (element.document || element.ownerDocument).querySelectorAll(selector);\n\t\t\tvar index = 0;\n\n\t\t\twhile (elements[index] && elements[index] !== element) {\n\t\t\t\t++index;\n\t\t\t}\n\n\t\t\treturn Boolean(elements[index]);\n\t\t};\n\t}\n\n\tif (typeof ElementProto.closest !== 'function') {\n\t\tElementProto.closest = function closest(selector) {\n\t\t\tvar element = this;\n\n\t\t\twhile (element && element.nodeType === 1) {\n\t\t\t\tif (element.matches(selector)) {\n\t\t\t\t\treturn element;\n\t\t\t\t}\n\n\t\t\t\telement = element.parentNode;\n\t\t\t}\n\n\t\t\treturn null;\n\t\t};\n\t}\n})(window.Element.prototype);\n","/**\n * lodash (Custom Build) <https://lodash.com/>\n * Build: `lodash modularize exports=\"npm\" -o ./`\n * Copyright jQuery Foundation and other contributors <https://jquery.org/>\n * Released under MIT license <https://lodash.com/license>\n * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>\n * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors\n */\n\n/** Used as the `TypeError` message for \"Functions\" methods. */\nvar FUNC_ERROR_TEXT = 'Expected a function';\n\n/** Used as references for various `Number` constants. */\nvar NAN = 0 / 0;\n\n/** `Object#toString` result references. */\nvar symbolTag = '[object Symbol]';\n\n/** Used to match leading and trailing whitespace. */\nvar reTrim = /^\\s+|\\s+$/g;\n\n/** Used to detect bad signed hexadecimal string values. */\nvar reIsBadHex = /^[-+]0x[0-9a-f]+$/i;\n\n/** Used to detect binary string values. */\nvar reIsBinary = /^0b[01]+$/i;\n\n/** Used to detect octal string values. */\nvar reIsOctal = /^0o[0-7]+$/i;\n\n/** Built-in method references without a dependency on `root`. */\nvar freeParseInt = parseInt;\n\n/** Detect free variable `global` from Node.js. */\nvar freeGlobal = typeof global == 'object' && global && global.Object === Object && global;\n\n/** Detect free variable `self`. */\nvar freeSelf = typeof self == 'object' && self && self.Object === Object && self;\n\n/** Used as a reference to the global object. */\nvar root = freeGlobal || freeSelf || Function('return this')();\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar objectToString = objectProto.toString;\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMax = Math.max,\n    nativeMin = Math.min;\n\n/**\n * Gets the timestamp of the number of milliseconds that have elapsed since\n * the Unix epoch (1 January 1970 00:00:00 UTC).\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Date\n * @returns {number} Returns the timestamp.\n * @example\n *\n * _.defer(function(stamp) {\n *   console.log(_.now() - stamp);\n * }, _.now());\n * // => Logs the number of milliseconds it took for the deferred invocation.\n */\nvar now = function() {\n  return root.Date.now();\n};\n\n/**\n * Creates a debounced function that delays invoking `func` until after `wait`\n * milliseconds have elapsed since the last time the debounced function was\n * invoked. The debounced function comes with a `cancel` method to cancel\n * delayed `func` invocations and a `flush` method to immediately invoke them.\n * Provide `options` to indicate whether `func` should be invoked on the\n * leading and/or trailing edge of the `wait` timeout. The `func` is invoked\n * with the last arguments provided to the debounced function. Subsequent\n * calls to the debounced function return the result of the last `func`\n * invocation.\n *\n * **Note:** If `leading` and `trailing` options are `true`, `func` is\n * invoked on the trailing edge of the timeout only if the debounced function\n * is invoked more than once during the `wait` timeout.\n *\n * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred\n * until to the next tick, similar to `setTimeout` with a timeout of `0`.\n *\n * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)\n * for details over the differences between `_.debounce` and `_.throttle`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to debounce.\n * @param {number} [wait=0] The number of milliseconds to delay.\n * @param {Object} [options={}] The options object.\n * @param {boolean} [options.leading=false]\n *  Specify invoking on the leading edge of the timeout.\n * @param {number} [options.maxWait]\n *  The maximum time `func` is allowed to be delayed before it's invoked.\n * @param {boolean} [options.trailing=true]\n *  Specify invoking on the trailing edge of the timeout.\n * @returns {Function} Returns the new debounced function.\n * @example\n *\n * // Avoid costly calculations while the window size is in flux.\n * jQuery(window).on('resize', _.debounce(calculateLayout, 150));\n *\n * // Invoke `sendMail` when clicked, debouncing subsequent calls.\n * jQuery(element).on('click', _.debounce(sendMail, 300, {\n *   'leading': true,\n *   'trailing': false\n * }));\n *\n * // Ensure `batchLog` is invoked once after 1 second of debounced calls.\n * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });\n * var source = new EventSource('/stream');\n * jQuery(source).on('message', debounced);\n *\n * // Cancel the trailing debounced invocation.\n * jQuery(window).on('popstate', debounced.cancel);\n */\nfunction debounce(func, wait, options) {\n  var lastArgs,\n      lastThis,\n      maxWait,\n      result,\n      timerId,\n      lastCallTime,\n      lastInvokeTime = 0,\n      leading = false,\n      maxing = false,\n      trailing = true;\n\n  if (typeof func != 'function') {\n    throw new TypeError(FUNC_ERROR_TEXT);\n  }\n  wait = toNumber(wait) || 0;\n  if (isObject(options)) {\n    leading = !!options.leading;\n    maxing = 'maxWait' in options;\n    maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;\n    trailing = 'trailing' in options ? !!options.trailing : trailing;\n  }\n\n  function invokeFunc(time) {\n    var args = lastArgs,\n        thisArg = lastThis;\n\n    lastArgs = lastThis = undefined;\n    lastInvokeTime = time;\n    result = func.apply(thisArg, args);\n    return result;\n  }\n\n  function leadingEdge(time) {\n    // Reset any `maxWait` timer.\n    lastInvokeTime = time;\n    // Start the timer for the trailing edge.\n    timerId = setTimeout(timerExpired, wait);\n    // Invoke the leading edge.\n    return leading ? invokeFunc(time) : result;\n  }\n\n  function remainingWait(time) {\n    var timeSinceLastCall = time - lastCallTime,\n        timeSinceLastInvoke = time - lastInvokeTime,\n        result = wait - timeSinceLastCall;\n\n    return maxing ? nativeMin(result, maxWait - timeSinceLastInvoke) : result;\n  }\n\n  function shouldInvoke(time) {\n    var timeSinceLastCall = time - lastCallTime,\n        timeSinceLastInvoke = time - lastInvokeTime;\n\n    // Either this is the first call, activity has stopped and we're at the\n    // trailing edge, the system time has gone backwards and we're treating\n    // it as the trailing edge, or we've hit the `maxWait` limit.\n    return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||\n      (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));\n  }\n\n  function timerExpired() {\n    var time = now();\n    if (shouldInvoke(time)) {\n      return trailingEdge(time);\n    }\n    // Restart the timer.\n    timerId = setTimeout(timerExpired, remainingWait(time));\n  }\n\n  function trailingEdge(time) {\n    timerId = undefined;\n\n    // Only invoke if we have `lastArgs` which means `func` has been\n    // debounced at least once.\n    if (trailing && lastArgs) {\n      return invokeFunc(time);\n    }\n    lastArgs = lastThis = undefined;\n    return result;\n  }\n\n  function cancel() {\n    if (timerId !== undefined) {\n      clearTimeout(timerId);\n    }\n    lastInvokeTime = 0;\n    lastArgs = lastCallTime = lastThis = timerId = undefined;\n  }\n\n  function flush() {\n    return timerId === undefined ? result : trailingEdge(now());\n  }\n\n  function debounced() {\n    var time = now(),\n        isInvoking = shouldInvoke(time);\n\n    lastArgs = arguments;\n    lastThis = this;\n    lastCallTime = time;\n\n    if (isInvoking) {\n      if (timerId === undefined) {\n        return leadingEdge(lastCallTime);\n      }\n      if (maxing) {\n        // Handle invocations in a tight loop.\n        timerId = setTimeout(timerExpired, wait);\n        return invokeFunc(lastCallTime);\n      }\n    }\n    if (timerId === undefined) {\n      timerId = setTimeout(timerExpired, wait);\n    }\n    return result;\n  }\n  debounced.cancel = cancel;\n  debounced.flush = flush;\n  return debounced;\n}\n\n/**\n * Checks if `value` is the\n * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)\n * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an object, else `false`.\n * @example\n *\n * _.isObject({});\n * // => true\n *\n * _.isObject([1, 2, 3]);\n * // => true\n *\n * _.isObject(_.noop);\n * // => true\n *\n * _.isObject(null);\n * // => false\n */\nfunction isObject(value) {\n  var type = typeof value;\n  return !!value && (type == 'object' || type == 'function');\n}\n\n/**\n * Checks if `value` is object-like. A value is object-like if it's not `null`\n * and has a `typeof` result of \"object\".\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is object-like, else `false`.\n * @example\n *\n * _.isObjectLike({});\n * // => true\n *\n * _.isObjectLike([1, 2, 3]);\n * // => true\n *\n * _.isObjectLike(_.noop);\n * // => false\n *\n * _.isObjectLike(null);\n * // => false\n */\nfunction isObjectLike(value) {\n  return !!value && typeof value == 'object';\n}\n\n/**\n * Checks if `value` is classified as a `Symbol` primitive or object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.\n * @example\n *\n * _.isSymbol(Symbol.iterator);\n * // => true\n *\n * _.isSymbol('abc');\n * // => false\n */\nfunction isSymbol(value) {\n  return typeof value == 'symbol' ||\n    (isObjectLike(value) && objectToString.call(value) == symbolTag);\n}\n\n/**\n * Converts `value` to a number.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to process.\n * @returns {number} Returns the number.\n * @example\n *\n * _.toNumber(3.2);\n * // => 3.2\n *\n * _.toNumber(Number.MIN_VALUE);\n * // => 5e-324\n *\n * _.toNumber(Infinity);\n * // => Infinity\n *\n * _.toNumber('3.2');\n * // => 3.2\n */\nfunction toNumber(value) {\n  if (typeof value == 'number') {\n    return value;\n  }\n  if (isSymbol(value)) {\n    return NAN;\n  }\n  if (isObject(value)) {\n    var other = typeof value.valueOf == 'function' ? value.valueOf() : value;\n    value = isObject(other) ? (other + '') : other;\n  }\n  if (typeof value != 'string') {\n    return value === 0 ? value : +value;\n  }\n  value = value.replace(reTrim, '');\n  var isBinary = reIsBinary.test(value);\n  return (isBinary || reIsOctal.test(value))\n    ? freeParseInt(value.slice(2), isBinary ? 2 : 8)\n    : (reIsBadHex.test(value) ? NAN : +value);\n}\n\nmodule.exports = debounce;\n","/*\nobject-assign\n(c) Sindre Sorhus\n@license MIT\n*/\n\n'use strict';\n/* eslint-disable no-unused-vars */\nvar getOwnPropertySymbols = Object.getOwnPropertySymbols;\nvar hasOwnProperty = Object.prototype.hasOwnProperty;\nvar propIsEnumerable = Object.prototype.propertyIsEnumerable;\n\nfunction toObject(val) {\n\tif (val === null || val === undefined) {\n\t\tthrow new TypeError('Object.assign cannot be called with null or undefined');\n\t}\n\n\treturn Object(val);\n}\n\nfunction shouldUseNative() {\n\ttry {\n\t\tif (!Object.assign) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Detect buggy property enumeration order in older V8 versions.\n\n\t\t// https://bugs.chromium.org/p/v8/issues/detail?id=4118\n\t\tvar test1 = new String('abc');  // eslint-disable-line no-new-wrappers\n\t\ttest1[5] = 'de';\n\t\tif (Object.getOwnPropertyNames(test1)[0] === '5') {\n\t\t\treturn false;\n\t\t}\n\n\t\t// https://bugs.chromium.org/p/v8/issues/detail?id=3056\n\t\tvar test2 = {};\n\t\tfor (var i = 0; i < 10; i++) {\n\t\t\ttest2['_' + String.fromCharCode(i)] = i;\n\t\t}\n\t\tvar order2 = Object.getOwnPropertyNames(test2).map(function (n) {\n\t\t\treturn test2[n];\n\t\t});\n\t\tif (order2.join('') !== '0123456789') {\n\t\t\treturn false;\n\t\t}\n\n\t\t// https://bugs.chromium.org/p/v8/issues/detail?id=3056\n\t\tvar test3 = {};\n\t\t'abcdefghijklmnopqrst'.split('').forEach(function (letter) {\n\t\t\ttest3[letter] = letter;\n\t\t});\n\t\tif (Object.keys(Object.assign({}, test3)).join('') !==\n\t\t\t\t'abcdefghijklmnopqrst') {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t} catch (err) {\n\t\t// We don't expect any of the above to throw, but better to be safe.\n\t\treturn false;\n\t}\n}\n\nmodule.exports = shouldUseNative() ? Object.assign : function (target, source) {\n\tvar from;\n\tvar to = toObject(target);\n\tvar symbols;\n\n\tfor (var s = 1; s < arguments.length; s++) {\n\t\tfrom = Object(arguments[s]);\n\n\t\tfor (var key in from) {\n\t\t\tif (hasOwnProperty.call(from, key)) {\n\t\t\t\tto[key] = from[key];\n\t\t\t}\n\t\t}\n\n\t\tif (getOwnPropertySymbols) {\n\t\t\tsymbols = getOwnPropertySymbols(from);\n\t\t\tfor (var i = 0; i < symbols.length; i++) {\n\t\t\t\tif (propIsEnumerable.call(from, symbols[i])) {\n\t\t\t\t\tto[symbols[i]] = from[symbols[i]];\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\treturn to;\n};\n","const assign = require('object-assign');\nconst delegate = require('../delegate');\nconst delegateAll = require('../delegateAll');\n\nconst DELEGATE_PATTERN = /^(.+):delegate\\((.+)\\)$/;\nconst SPACE = ' ';\n\nconst getListeners = function(type, handler) {\n  var match = type.match(DELEGATE_PATTERN);\n  var selector;\n  if (match) {\n    type = match[1];\n    selector = match[2];\n  }\n\n  var options;\n  if (typeof handler === 'object') {\n    options = {\n      capture: popKey(handler, 'capture'),\n      passive: popKey(handler, 'passive')\n    };\n  }\n\n  var listener = {\n    selector: selector,\n    delegate: (typeof handler === 'object')\n      ? delegateAll(handler)\n      : selector\n        ? delegate(selector, handler)\n        : handler,\n    options: options\n  };\n\n  if (type.indexOf(SPACE) > -1) {\n    return type.split(SPACE).map(function(_type) {\n      return assign({type: _type}, listener);\n    });\n  } else {\n    listener.type = type;\n    return [listener];\n  }\n};\n\nvar popKey = function(obj, key) {\n  var value = obj[key];\n  delete obj[key];\n  return value;\n};\n\nmodule.exports = function behavior(events, props) {\n  const listeners = Object.keys(events)\n    .reduce(function(memo, type) {\n      var listeners = getListeners(type, events[type]);\n      return memo.concat(listeners);\n    }, []);\n\n  return assign({\n    add: function addBehavior(element) {\n      listeners.forEach(function(listener) {\n        element.addEventListener(\n          listener.type,\n          listener.delegate,\n          listener.options\n        );\n      });\n    },\n    remove: function removeBehavior(element) {\n      listeners.forEach(function(listener) {\n        element.removeEventListener(\n          listener.type,\n          listener.delegate,\n          listener.options\n        );\n      });\n    }\n  }, props);\n};\n","module.exports = function compose(functions) {\n  return function(e) {\n    return functions.some(function(fn) {\n      return fn.call(this, e) === false;\n    }, this);\n  };\n};\n","// polyfill Element.prototype.closest\nrequire('element-closest');\n\nmodule.exports = function delegate(selector, fn) {\n  return function delegation(event) {\n    var target = event.target.closest(selector);\n    if (target) {\n      return fn.call(target, event);\n    }\n  }\n};\n","const delegate = require('../delegate');\nconst compose = require('../compose');\n\nconst SPLAT = '*';\n\nmodule.exports = function delegateAll(selectors) {\n  const keys = Object.keys(selectors)\n\n  // XXX optimization: if there is only one handler and it applies to\n  // all elements (the \"*\" CSS selector), then just return that\n  // handler\n  if (keys.length === 1 && keys[0] === SPLAT) {\n    return selectors[SPLAT];\n  }\n\n  const delegates = keys.reduce(function(memo, selector) {\n    memo.push(delegate(selector, selectors[selector]));\n    return memo;\n  }, []);\n  return compose(delegates);\n};\n","module.exports = function ignore(element, fn) {\n  return function ignorance(e) {\n    if (element !== e.target && !element.contains(e.target)) {\n      return fn.call(this, e);\n    }\n  };\n};\n","module.exports = function once(listener, options) {\n  var wrapped = function wrappedOnce(e) {\n    e.currentTarget.removeEventListener(e.type, wrapped, options);\n    return listener.call(this, e);\n  };\n  return wrapped;\n};\n\n","'use strict';\n\nvar RE_TRIM = /(^\\s+)|(\\s+$)/g;\nvar RE_SPLIT = /\\s+/;\n\nvar trim = String.prototype.trim\n  ? function(str) { return str.trim(); }\n  : function(str) { return str.replace(RE_TRIM, ''); };\n\nvar queryById = function(id) {\n  return this.querySelector('[id=\"' + id.replace(/\"/g, '\\\\\"') + '\"]');\n};\n\nmodule.exports = function resolveIds(ids, doc) {\n  if (typeof ids !== 'string') {\n    throw new Error('Expected a string but got ' + (typeof ids));\n  }\n\n  if (!doc) {\n    doc = window.document;\n  }\n\n  var getElementById = doc.getElementById\n    ? doc.getElementById.bind(doc)\n    : queryById.bind(doc);\n\n  ids = trim(ids).split(RE_SPLIT);\n\n  // XXX we can short-circuit here because trimming and splitting a\n  // string of just whitespace produces an array containing a single,\n  // empty string\n  if (ids.length === 1 && ids[0] === '') {\n    return [];\n  }\n\n  return ids\n    .map(function(id) {\n      var el = getElementById(id);\n      if (!el) {\n        throw new Error('no element with id: \"' + id + '\"');\n      }\n      return el;\n    });\n};\n","'use strict';\nconst behavior = require('../utils/behavior');\nconst filter = require('array-filter');\nconst forEach = require('array-foreach');\nconst toggle = require('../utils/toggle');\nconst isElementInViewport = require('../utils/is-in-viewport');\n\nconst CLICK = require('../events').CLICK;\nconst PREFIX = require('../config').prefix;\n\n// XXX match .usa-accordion and .usa-accordion-bordered\nconst ACCORDION = `.${PREFIX}-accordion, .${PREFIX}-accordion-bordered`;\nconst BUTTON = `.${PREFIX}-accordion-button[aria-controls]`;\nconst EXPANDED = 'aria-expanded';\nconst MULTISELECTABLE = 'aria-multiselectable';\n\n/**\n * Toggle a button's \"pressed\" state, optionally providing a target\n * state.\n *\n * @param {HTMLButtonElement} button\n * @param {boolean?} expanded If no state is provided, the current\n * state will be toggled (from false to true, and vice-versa).\n * @return {boolean} the resulting state\n */\nconst toggleButton = (button, expanded) => {\n  var accordion = button.closest(ACCORDION);\n  if (!accordion) {\n    throw new Error(`${BUTTON} is missing outer ${ACCORDION}`);\n  }\n\n  expanded = toggle(button, expanded);\n  // XXX multiselectable is opt-in, to preserve legacy behavior\n  const multiselectable = accordion.getAttribute(MULTISELECTABLE) === 'true';\n\n  if (expanded && !multiselectable) {\n    forEach(getAccordionButtons(accordion), other => {\n      if (other !== button) {\n        toggle(other, false);\n      }\n    });\n  }\n};\n\n/**\n * @param {HTMLButtonElement} button\n * @return {boolean} true\n */\nconst showButton = button => toggleButton(button, true);\n\n/**\n * @param {HTMLButtonElement} button\n * @return {boolean} false\n */\nconst hideButton = button => toggleButton(button, false);\n\n/**\n * Get an Array of button elements belonging directly to the given\n * accordion element.\n * @param {HTMLElement} accordion\n * @return {array<HTMLButtonElement>}\n */\nconst getAccordionButtons = accordion => {\n  return filter(accordion.querySelectorAll(BUTTON), button => {\n    return button.closest(ACCORDION) === accordion;\n  });\n};\n\nconst accordion = behavior({\n  [ CLICK ]: {\n    [ BUTTON ]: function (event) {\n      event.preventDefault();\n      toggleButton(this);\n\n      if (this.getAttribute(EXPANDED) === 'true') {\n        // We were just expanded, but if another accordion was also just\n        // collapsed, we may no longer be in the viewport. This ensures\n        // that we are still visible, so the user isn't confused.\n        if (!isElementInViewport(this)) this.scrollIntoView();\n      }\n    },\n  },\n}, {\n  init: root => {\n    forEach(root.querySelectorAll(BUTTON), button => {\n      const expanded = button.getAttribute(EXPANDED) === 'true';\n      toggleButton(button, expanded);\n    });\n  },\n  ACCORDION,\n  BUTTON,\n  show: showButton,\n  hide: hideButton,\n  toggle: toggleButton,\n  getButtons: getAccordionButtons,\n});\n\n/**\n * TODO: for 2.0, remove everything below this comment and export the\n * behavior directly:\n *\n * module.exports = behavior({...});\n */\nconst Accordion = function (root) {\n  this.root = root;\n  accordion.on(this.root);\n};\n\n// copy all of the behavior methods and props to Accordion\nconst assign = require('object-assign');\nassign(Accordion, accordion);\n\nAccordion.prototype.show = showButton;\nAccordion.prototype.hide = hideButton;\n\nAccordion.prototype.remove = function () {\n  accordion.off(this.root);\n};\n\nmodule.exports = Accordion;\n","'use strict';\nconst behavior = require('../utils/behavior');\nconst toggle = require('../utils/toggle');\n\nconst CLICK = require('../events').CLICK;\nconst PREFIX = require('../config').prefix;\n\nconst HEADER = `.${PREFIX}-banner-header`;\nconst EXPANDED_CLASS = `${PREFIX}-banner-header-expanded`;\n\nconst toggleBanner = function (event) {\n  event.preventDefault();\n  this.closest(HEADER).classList.toggle(EXPANDED_CLASS);\n  return false;\n};\n\nmodule.exports = behavior({\n  [ CLICK ]: {\n    [ `${HEADER} [aria-controls]` ]: toggleBanner,\n  },\n});\n","'use strict';\nconst accordion = require('./accordion');\nconst behavior = require('../utils/behavior');\nconst debounce = require('lodash.debounce');\nconst forEach = require('array-foreach');\nconst select = require('../utils/select');\n\nconst CLICK = require('../events').CLICK;\nconst PREFIX = require('../config').prefix;\n\nconst HIDDEN = 'hidden';\nconst SCOPE = `.${PREFIX}-footer-big`;\nconst NAV = `${SCOPE} nav`;\nconst BUTTON = `${NAV} .${PREFIX}-footer-primary-link`;\nconst LIST = `${NAV} ul`;\n\nconst HIDE_MAX_WIDTH = 600;\nconst DEBOUNCE_RATE = 180;\n\nconst showPanel = function () {\n  const list = this.closest(LIST);\n  list.classList.remove(HIDDEN);\n\n  // NB: this *should* always succeed because the button\n  // selector is scoped to \".{prefix}-footer-big nav\"\n  const lists = list.closest(NAV)\n    .querySelectorAll('ul');\n\n  forEach(lists, el => {\n    if (el !== list) {\n      el.classList.add(HIDDEN);\n    }\n  });\n};\n\nconst resize = debounce(() => {\n  const hidden = window.innerWidth < HIDE_MAX_WIDTH;\n  forEach(select(LIST), list => {\n    list.classList.toggle(HIDDEN, hidden);\n  });\n}, DEBOUNCE_RATE);\n\nmodule.exports = behavior({\n  [ CLICK ]: {\n    [ BUTTON ]: showPanel,\n  },\n}, {\n  // export for use elsewhere\n  HIDE_MAX_WIDTH,\n  DEBOUNCE_RATE,\n\n  init: target => {\n    resize();\n    window.addEventListener('resize', resize);\n  },\n\n  teardown: target => {\n    window.removeEventListener('resize', resize);\n  },\n});\n","module.exports = {\n  accordion:  require('./accordion'),\n  banner:     require('./banner'),\n  footer:     require('./footer'),\n  navigation: require('./navigation'),\n  password:   require('./password'),\n  search:     require('./search'),\n  skipnav:    require('./skipnav'),\n  validator:  require('./validator'),\n};\n\n","'use strict';\nconst behavior = require('../utils/behavior');\nconst forEach = require('array-foreach');\nconst select = require('../utils/select');\nconst accordion = require('./accordion');\n\nconst CLICK = require('../events').CLICK;\nconst PREFIX = require('../config').prefix;\n\nconst NAV = `.${PREFIX}-nav`;\nconst NAV_LINKS = `${NAV} a`;\nconst OPENERS = `.${PREFIX}-menu-btn`;\nconst CLOSE_BUTTON = `.${PREFIX}-nav-close`;\nconst OVERLAY = `.${PREFIX}-overlay`;\nconst CLOSERS = `${CLOSE_BUTTON}, .${PREFIX}-overlay`;\nconst TOGGLES = [ NAV, OVERLAY ].join(', ');\n\nconst ACTIVE_CLASS = 'usa-mobile_nav-active';\nconst VISIBLE_CLASS = 'is-visible';\n\nconst isActive = () => document.body.classList.contains(ACTIVE_CLASS);\n\nconst toggleNav = function (active) {\n  const body = document.body;\n  if (typeof active !== 'boolean') {\n    active = !isActive();\n  }\n  body.classList.toggle(ACTIVE_CLASS, active);\n\n  forEach(select(TOGGLES), el => {\n    el.classList.toggle(VISIBLE_CLASS, active);\n  });\n\n  const closeButton = body.querySelector(CLOSE_BUTTON);\n  const menuButton = body.querySelector(OPENERS);\n\n  if (active && closeButton) {\n    // The mobile nav was just activated, so focus on the close button,\n    // which is just before all the nav elements in the tab order.\n    closeButton.focus();\n  } else if (!active && document.activeElement === closeButton &&\n             menuButton) {\n    // The mobile nav was just deactivated, and focus was on the close\n    // button, which is no longer visible. We don't want the focus to\n    // disappear into the void, so focus on the menu button if it's\n    // visible (this may have been what the user was just focused on,\n    // if they triggered the mobile nav by mistake).\n    menuButton.focus();\n  }\n\n  return active;\n};\n\nconst resize = () => {\n  const closer = document.body.querySelector(CLOSE_BUTTON);\n\n  if (isActive() && closer && closer.getBoundingClientRect().width === 0) {\n    // The mobile nav is active, but the close box isn't visible, which\n    // means the user's viewport has been resized so that it is no longer\n    // in mobile mode. Let's make the page state consistent by\n    // deactivating the mobile nav.\n    toggleNav.call(closer, false);\n  }\n};\n\nconst navigation = behavior({\n  [ CLICK ]: {\n    [ OPENERS ]: toggleNav,\n    [ CLOSERS ]: toggleNav,\n    [ NAV_LINKS ]: function () {\n      // A navigation link has been clicked! We want to collapse any\n      // hierarchical navigation UI it's a part of, so that the user\n      // can focus on whatever they've just selected.\n\n      // Some navigation links are inside accordions; when they're\n      // clicked, we want to collapse those accordions.\n      const acc = this.closest(accordion.ACCORDION);\n      if (acc) {\n        accordion.getButtons(acc).forEach(btn => accordion.hide(btn));\n      }\n\n      // If the mobile navigation menu is active, we want to hide it.\n      if (isActive()) {\n        toggleNav.call(this, false);\n      }\n    },\n  },\n}, {\n  init () {\n    resize();\n    window.addEventListener('resize', resize, false);\n  },\n  teardown () {\n    window.removeEventListener('resize', resize, false);\n  },\n});\n\n/**\n * TODO for 2.0, remove this statement and export `navigation` directly:\n *\n * module.exports = behavior({...});\n */\nconst assign = require('object-assign');\nmodule.exports = assign(\n  el => navigation.on(el),\n  navigation\n);\n","'use strict';\nconst behavior = require('../utils/behavior');\nconst toggleFormInput = require('../utils/toggle-form-input');\n\nconst CLICK = require('../events').CLICK;\nconst PREFIX = require('../config').prefix;\n\nconst LINK = `.${PREFIX}-show_password, .${PREFIX}-show_multipassword`;\n\nconst toggle = function (event) {\n  event.preventDefault();\n  toggleFormInput(this);\n};\n\nmodule.exports = behavior({\n  [ CLICK ]: {\n    [ LINK ]: toggle,\n  },\n});\n","'use strict';\nconst behavior = require('../utils/behavior');\nconst forEach = require('array-foreach');\nconst ignore = require('receptor/ignore');\nconst select = require('../utils/select');\n\nconst CLICK = require('../events').CLICK;\nconst PREFIX = require('../config').prefix;\n\nconst BUTTON = '.js-search-button';\nconst FORM = '.js-search-form';\nconst INPUT = '[type=search]';\nconst CONTEXT = 'header'; // XXX\nconst VISUALLY_HIDDEN = `${PREFIX}-sr-only`;\n\nlet lastButton;\n\nconst showSearch = function (event) {\n  toggleSearch(this, true);\n  lastButton = this;\n};\n\nconst hideSearch = function (event) {\n  toggleSearch(this, false);\n  lastButton = undefined;\n};\n\nconst getForm = button => {\n  const context = button.closest(CONTEXT);\n  return context\n    ? context.querySelector(FORM)\n    : document.querySelector(FORM);\n};\n\nconst toggleSearch = (button, active) => {\n  const form = getForm(button);\n  if (!form) {\n    throw new Error(`No ${FORM} found for search toggle in ${CONTEXT}!`);\n  }\n\n  button.hidden = active;\n  form.classList.toggle(VISUALLY_HIDDEN, !active);\n\n  if (active) {\n    const input = form.querySelector(INPUT);\n    if (input) {\n      input.focus();\n    }\n    // when the user clicks _outside_ of the form w/ignore(): hide the\n    // search, then remove the listener\n    const listener = ignore(form, e => {\n      if (lastButton) {\n        hideSearch.call(lastButton);\n      }\n      document.body.removeEventListener(CLICK, listener);\n    });\n\n    // Normally we would just run this code without a timeout, but\n    // IE11 and Edge will actually call the listener *immediately* because\n    // they are currently handling this exact type of event, so we'll\n    // make sure the browser is done handling the current click event,\n    // if any, before we attach the listener.\n    setTimeout(() => {\n      document.body.addEventListener(CLICK, listener);\n    }, 0);\n  }\n};\n\nconst search = behavior({\n  [ CLICK ]: {\n    [ BUTTON ]: showSearch,\n  },\n}, {\n  init: (target) => {\n    forEach(select(BUTTON, target), button => {\n      toggleSearch(button, false);\n    });\n  },\n  teardown: (target) => {\n    // forget the last button clicked\n    lastButton = undefined;\n  },\n});\n\n/**\n * TODO for 2.0, remove this statement and export `navigation` directly:\n *\n * module.exports = behavior({...});\n */\nconst assign = require('object-assign');\nmodule.exports = assign(\n  el => search.on(el),\n  search\n);\n","'use strict';\nconst behavior = require('../utils/behavior');\nconst once = require('receptor/once');\n\nconst CLICK = require('../events').CLICK;\nconst PREFIX = require('../config').prefix;\nconst LINK = `.${PREFIX}-skipnav[href^=\"#\"]`;\n\nconst setTabindex = function (event) {\n  // NB: we know because of the selector we're delegating to below that the\n  // href already begins with '#'\n  const id = this.getAttribute('href').slice(1);\n  const target = document.getElementById(id);\n  if (target) {\n    target.setAttribute('tabindex', 0);\n    target.addEventListener('blur', once(event => {\n      target.setAttribute('tabindex', -1);\n    }));\n  } else {\n    // throw an error?\n  }\n};\n\nmodule.exports = behavior({\n  [ CLICK ]: {\n    [ LINK ]: setTabindex,\n  },\n});\n","'use strict';\nconst behavior = require('../utils/behavior');\nconst validate = require('../utils/validate-input');\nconst debounce = require('lodash.debounce');\n\nconst change = function (event) {\n  return validate(this);\n};\n\nconst validator = behavior({\n  'keyup change': {\n    'input[data-validation-element]': change,\n  },\n});\n\n/**\n * TODO for 2.0, remove this statement and export `navigation` directly:\n *\n * module.exports = behavior({...});\n */\nconst assign = require('object-assign');\nmodule.exports = assign(\n  el => validator.on(el),\n  validator\n);\n","module.exports = {\n  prefix: 'usa',\n};\n","module.exports = {\n  // This used to be conditionally dependent on whether the\n  // browser supported touch events; if it did, `CLICK` was set to\n  // `touchstart`.  However, this had downsides:\n  //\n  // * It pre-empted mobile browsers' default behavior of detecting\n  //   whether a touch turned into a scroll, thereby preventing\n  //   users from using some of our components as scroll surfaces.\n  //\n  // * Some devices, such as the Microsoft Surface Pro, support *both*\n  //   touch and clicks. This meant the conditional effectively dropped\n  //   support for the user's mouse, frustrating users who preferred\n  //   it on those systems.\n  CLICK: 'click',\n};\n","'use strict';\nconst elproto = window.HTMLElement.prototype;\nconst HIDDEN = 'hidden';\n\nif (!(HIDDEN in elproto)) {\n  Object.defineProperty(elproto, HIDDEN, {\n    get: function () {\n      return this.hasAttribute(HIDDEN);\n    },\n    set: function (value) {\n      if (value) {\n        this.setAttribute(HIDDEN, '');\n      } else {\n        this.removeAttribute(HIDDEN);\n      }\n    },\n  });\n}\n","'use strict';\n// polyfills HTMLElement.prototype.classList and DOMTokenList\nrequire('classlist-polyfill');\n// polyfills HTMLElement.prototype.hidden\nrequire('./element-hidden');\n","'use strict';\nconst domready = require('domready');\n\n/**\n * The 'polyfills' define key ECMAScript 5 methods that may be missing from\n * older browsers, so must be loaded first.\n */\nrequire('./polyfills');\n\nconst uswds = require('./config');\n\nconst components = require('./components');\nuswds.components = components;\n\ndomready(() => {\n  const target = document.body;\n  for (let name in components) {\n    const behavior = components[ name ];\n    behavior.on(target);\n  }\n});\n\nmodule.exports = uswds;\n","'use strict';\nconst assign = require('object-assign');\nconst forEach = require('array-foreach');\nconst Behavior = require('receptor/behavior');\n\nconst sequence = function () {\n  const seq = [].slice.call(arguments);\n  return function (target) {\n    if (!target) {\n      target = document.body;\n    }\n    forEach(seq, method => {\n      if (typeof this[ method ] === 'function') {\n        this[ method ].call(this, target);\n      }\n    });\n  };\n};\n\n/**\n * @name behavior\n * @param {object} events\n * @param {object?} props\n * @return {receptor.behavior}\n */\nmodule.exports = (events, props) => {\n  return Behavior(events, assign({\n    on:   sequence('init', 'add'),\n    off:  sequence('teardown', 'remove'),\n  }, props));\n};\n","// https://stackoverflow.com/a/7557433\nfunction isElementInViewport (el, win=window,\n                              docEl=document.documentElement) {\n  var rect = el.getBoundingClientRect();\n\n  return (\n    rect.top >= 0 &&\n    rect.left >= 0 &&\n    rect.bottom <= (win.innerHeight || docEl.clientHeight) &&\n    rect.right <= (win.innerWidth || docEl.clientWidth)\n  );\n}\n\nmodule.exports = isElementInViewport;\n","'use strict';\n\n/**\n * @name isElement\n * @desc returns whether or not the given argument is a DOM element.\n * @param {any} value\n * @return {boolean}\n */\nconst isElement = value => {\n  return value && typeof value === 'object' && value.nodeType === 1;\n};\n\n/**\n * @name select\n * @desc selects elements from the DOM by class selector or ID selector.\n * @param {string} selector - The selector to traverse the DOM with.\n * @param {Document|HTMLElement?} context - The context to traverse the DOM\n *   in. If not provided, it defaults to the document.\n * @return {HTMLElement[]} - An array of DOM nodes or an empty array.\n */\nmodule.exports = function select (selector, context) {\n\n  if (typeof selector !== 'string') {\n    return [];\n  }\n\n  if (!context || !isElement(context)) {\n    context = window.document;\n  }\n\n  const selection = context.querySelectorAll(selector);\n  return Array.prototype.slice.call(selection);\n};\n","/**\n * Flips given INPUT elements between masked (hiding the field value) and unmasked\n * @param {Array.HTMLElement} fields - An array of INPUT elements\n * @param {Boolean} mask - Whether the mask should be applied, hiding the field value\n */\nmodule.exports = (field, mask) => {\n  field.setAttribute('autocapitalize', 'off');\n  field.setAttribute('autocorrect', 'off');\n  field.setAttribute('type', mask ? 'password' : 'text');\n};\n","'use strict';\nconst forEach = require('array-foreach');\nconst resolveIdRefs = require('resolve-id-refs');\nconst select = require('./select');\nconst toggleFieldMask = require('./toggle-field-mask');\n\nconst CONTROLS = 'aria-controls';\nconst PRESSED = 'aria-pressed';\nconst SHOW_ATTR = 'data-show-text';\nconst HIDE_ATTR = 'data-hide-text';\n\n/**\n * Replace the word \"Show\" (or \"show\") with \"Hide\" (or \"hide\") in a string.\n * @param {string} showText\n * @return {strong} hideText\n */\nconst getHideText = showText => {\n  return showText.replace(/\\bShow\\b/i, show => {\n    return ('S' === show[ 0 ] ? 'H' : 'h') + 'ide';\n  });\n};\n\n/**\n * Component that decorates an HTML element with the ability to toggle the\n * masked state of an input field (like a password) when clicked.\n * The ids of the fields to be masked will be pulled directly from the button's\n * `aria-controls` attribute.\n *\n * @param  {HTMLElement} el    Parent element containing the fields to be masked\n * @return {boolean}\n */\nmodule.exports = el => {\n  // this is the *target* state:\n  // * if the element has the attr and it's !== \"true\", pressed is true\n  // * otherwise, pressed is false\n  const pressed = el.hasAttribute(PRESSED)\n    && el.getAttribute(PRESSED) !== 'true';\n\n  const fields = resolveIdRefs(el.getAttribute(CONTROLS));\n  forEach(fields, field => toggleFieldMask(field, pressed));\n\n  if (!el.hasAttribute(SHOW_ATTR)) {\n    el.setAttribute(SHOW_ATTR, el.textContent);\n  }\n\n  const showText = el.getAttribute(SHOW_ATTR);\n  const hideText = el.getAttribute(HIDE_ATTR) || getHideText(showText);\n\n  el.textContent = pressed ? showText : hideText;\n  el.setAttribute(PRESSED, pressed);\n  return pressed;\n};\n","'use strict';\nconst EXPANDED = 'aria-expanded';\nconst CONTROLS = 'aria-controls';\nconst HIDDEN = 'aria-hidden';\n\nmodule.exports = (button, expanded) => {\n\n  if (typeof expanded !== 'boolean') {\n    expanded = button.getAttribute(EXPANDED) === 'false';\n  }\n  button.setAttribute(EXPANDED, expanded);\n\n  const id = button.getAttribute(CONTROLS);\n  const controls = document.getElementById(id);\n  if (!controls) {\n    throw new Error(\n      'No toggle target found with id: \"' + id + '\"'\n    );\n  }\n\n  controls.setAttribute(HIDDEN, !expanded);\n  return expanded;\n};\n","'use strict';\nconst dataset = require('elem-dataset');\n\nconst PREFIX = require('../config').prefix;\nconst CHECKED = 'aria-checked';\nconst CHECKED_CLASS = `${PREFIX}-checklist-checked`;\n\nmodule.exports = function validate (el) {\n  const data = dataset(el);\n  const id = data.validationElement;\n  const checkList = id.charAt(0) === '#'\n    ? document.querySelector(id)\n    : document.getElementById(id);\n\n  if (!checkList) {\n    throw new Error(\n      `No validation element found with id: \"${id}\"`\n    );\n  }\n\n  for (const key in data) {\n    if (key.startsWith('validate')) {\n      const validatorName = key.substr('validate'.length).toLowerCase();\n      const validatorPattern = new RegExp(data[ key ]);\n      const validatorSelector = `[data-validator=\"${validatorName}\"]`;\n      const validatorCheckbox = checkList.querySelector(validatorSelector);\n      if (!validatorCheckbox) {\n        throw new Error(\n          `No validator checkbox found for: \"${validatorName}\"`\n        );\n      }\n\n      const checked = validatorPattern.test(el.value);\n      validatorCheckbox.classList.toggle(CHECKED_CLASS, checked);\n      validatorCheckbox.setAttribute(CHECKED, checked);\n    }\n  }\n};\n"]}