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smoothscroll v0.4.4 - 2019 - Dustan Kasten, Jeremias Menichelli - MIT License */\n(function () {\n 'use strict';\n\n // polyfill\n function polyfill() {\n // aliases\n var w = window;\n var d = document;\n\n // return if scroll behavior is supported and polyfill is not forced\n if (\n 'scrollBehavior' in d.documentElement.style &&\n w.__forceSmoothScrollPolyfill__ !== true\n ) {\n return;\n }\n\n // globals\n var Element = w.HTMLElement || w.Element;\n var SCROLL_TIME = 468;\n\n // object gathering original scroll methods\n var original = {\n scroll: w.scroll || w.scrollTo,\n scrollBy: w.scrollBy,\n elementScroll: Element.prototype.scroll || scrollElement,\n scrollIntoView: Element.prototype.scrollIntoView\n };\n\n // define timing method\n var now =\n w.performance && w.performance.now\n ? w.performance.now.bind(w.performance)\n : Date.now;\n\n /**\n * indicates if a the current browser is made by Microsoft\n * @method isMicrosoftBrowser\n * @param {String} userAgent\n * @returns {Boolean}\n */\n function isMicrosoftBrowser(userAgent) {\n var userAgentPatterns = ['MSIE ', 'Trident/', 'Edge/'];\n\n return new RegExp(userAgentPatterns.join('|')).test(userAgent);\n }\n\n /*\n * IE has rounding bug rounding down clientHeight and clientWidth and\n * rounding up scrollHeight and scrollWidth causing false positives\n * on hasScrollableSpace\n */\n var ROUNDING_TOLERANCE = isMicrosoftBrowser(w.navigator.userAgent) ? 1 : 0;\n\n /**\n * changes scroll position inside an element\n * @method scrollElement\n * @param {Number} x\n * @param {Number} y\n * @returns {undefined}\n */\n function scrollElement(x, y) {\n this.scrollLeft = x;\n this.scrollTop = y;\n }\n\n /**\n * returns result of applying ease math function to a number\n * @method ease\n * @param {Number} k\n * @returns {Number}\n */\n function ease(k) {\n return 0.5 * (1 - Math.cos(Math.PI * k));\n }\n\n /**\n * indicates if a smooth behavior should be applied\n * @method shouldBailOut\n * @param {Number|Object} firstArg\n * @returns {Boolean}\n */\n function shouldBailOut(firstArg) {\n if (\n firstArg === null ||\n typeof firstArg !== 'object' ||\n firstArg.behavior === undefined ||\n firstArg.behavior === 'auto' ||\n firstArg.behavior === 'instant'\n ) {\n // first argument is not an object/null\n // or behavior is auto, instant or undefined\n return true;\n }\n\n if (typeof firstArg === 'object' && firstArg.behavior === 'smooth') {\n // first argument is an object and behavior is smooth\n return false;\n }\n\n // throw error when behavior is not supported\n throw new TypeError(\n 'behavior member of ScrollOptions ' +\n firstArg.behavior +\n ' is not a valid value for enumeration ScrollBehavior.'\n );\n }\n\n /**\n * indicates if an element has scrollable space in the provided axis\n * @method hasScrollableSpace\n * @param {Node} el\n * @param {String} axis\n * @returns {Boolean}\n */\n function hasScrollableSpace(el, axis) {\n if (axis === 'Y') {\n return el.clientHeight + 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}\n\n /**\n * scrolls window or element with a smooth behavior\n * @method smoothScroll\n * @param {Object|Node} el\n * @param {Number} x\n * @param {Number} y\n * @returns {undefined}\n */\n function smoothScroll(el, x, y) {\n var scrollable;\n var startX;\n var startY;\n var method;\n var startTime = now();\n\n // define scroll context\n if (el === d.body) {\n scrollable = w;\n startX = w.scrollX || w.pageXOffset;\n startY = w.scrollY || w.pageYOffset;\n method = original.scroll;\n } else {\n scrollable = el;\n startX = el.scrollLeft;\n startY = el.scrollTop;\n method = scrollElement;\n }\n\n // scroll looping over a frame\n step({\n scrollable: scrollable,\n method: method,\n startTime: startTime,\n startX: startX,\n startY: startY,\n x: x,\n y: y\n });\n }\n\n // ORIGINAL METHODS OVERRIDES\n // w.scroll and w.scrollTo\n w.scroll = w.scrollTo = function() {\n // avoid action when no arguments are passed\n if (arguments[0] === undefined) {\n return;\n }\n\n // avoid smooth behavior if not required\n if (shouldBailOut(arguments[0]) === true) {\n original.scroll.call(\n w,\n arguments[0].left !== undefined\n ? arguments[0].left\n : typeof arguments[0] !== 'object'\n ? arguments[0]\n : w.scrollX || w.pageXOffset,\n // use top prop, second argument if present or fallback to scrollY\n arguments[0].top !== undefined\n ? arguments[0].top\n : arguments[1] !== undefined\n ? arguments[1]\n : w.scrollY || w.pageYOffset\n );\n\n return;\n }\n\n // LET THE SMOOTHNESS BEGIN!\n smoothScroll.call(\n w,\n d.body,\n arguments[0].left !== undefined\n ? ~~arguments[0].left\n : w.scrollX || w.pageXOffset,\n arguments[0].top !== undefined\n ? ~~arguments[0].top\n : w.scrollY || w.pageYOffset\n );\n };\n\n // w.scrollBy\n w.scrollBy = function() {\n // avoid action when no arguments are passed\n if (arguments[0] === undefined) {\n return;\n }\n\n // avoid smooth behavior if not required\n if (shouldBailOut(arguments[0])) {\n original.scrollBy.call(\n w,\n arguments[0].left !== undefined\n ? arguments[0].left\n : typeof arguments[0] !== 'object' ? arguments[0] : 0,\n arguments[0].top !== undefined\n ? arguments[0].top\n : arguments[1] !== undefined ? arguments[1] : 0\n );\n\n return;\n }\n\n // LET THE SMOOTHNESS BEGIN!\n smoothScroll.call(\n w,\n d.body,\n ~~arguments[0].left + (w.scrollX || w.pageXOffset),\n ~~arguments[0].top + (w.scrollY || w.pageYOffset)\n );\n };\n\n // Element.prototype.scroll and Element.prototype.scrollTo\n Element.prototype.scroll = Element.prototype.scrollTo = function() {\n // avoid action when no arguments are passed\n if (arguments[0] === undefined) {\n return;\n }\n\n // avoid smooth behavior if not required\n if (shouldBailOut(arguments[0]) === true) {\n // if one number is passed, throw error to match Firefox implementation\n if (typeof arguments[0] === 'number' && arguments[1] === undefined) {\n throw new SyntaxError('Value could not be converted');\n }\n\n original.elementScroll.call(\n this,\n // use left prop, first number argument or fallback to scrollLeft\n arguments[0].left !== undefined\n ? ~~arguments[0].left\n : typeof arguments[0] !== 'object' ? ~~arguments[0] : this.scrollLeft,\n // use top prop, second argument or fallback to scrollTop\n arguments[0].top !== undefined\n ? ~~arguments[0].top\n : arguments[1] !== undefined ? ~~arguments[1] : this.scrollTop\n );\n\n return;\n }\n\n var left = arguments[0].left;\n var top = arguments[0].top;\n\n // LET THE SMOOTHNESS BEGIN!\n smoothScroll.call(\n this,\n this,\n typeof left === 'undefined' ? this.scrollLeft : ~~left,\n typeof top === 'undefined' ? this.scrollTop : ~~top\n );\n };\n\n // Element.prototype.scrollBy\n Element.prototype.scrollBy = function() {\n // avoid action when no arguments are passed\n if (arguments[0] === undefined) {\n return;\n }\n\n // avoid smooth behavior if not required\n if (shouldBailOut(arguments[0]) === true) {\n original.elementScroll.call(\n this,\n arguments[0].left !== undefined\n ? ~~arguments[0].left + 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