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<reference path=\"../typings/niveax.d.ts\"/>\r\n\r\nimport { fromEvent, Observable } from 'rxjs';\r\nimport { takeUntil, filter, startWith, first } from 'rxjs/operators';\r\nimport { removeClassFromList, getElementHeight } from '../helpers/DOMHelpers';\r\nimport { getLastItemInArray, horizontalScrolling, isIOS, isSelectorValid } from '../helpers/helperFunctions';\r\nimport ScrollDirection from './ScrollDirection';\r\nimport smoothscroll from 'smoothscroll-polyfill';\r\n\r\nconst moduleSelector = '[data-module=\"AnchorNavigation\"]';\r\n\r\nexport default class AnchorNavigation {\r\n    private scrollDirection: ScrollDirection;\r\n    private navLinks: HTMLElement[];\r\n    private sections: HTMLElement[] = Array.from(document.querySelectorAll('div:not(.nx-tabs__item) > [data-anchor-text]'));\r\n    private scrollBody$: Observable<Event>;\r\n    private clickNav$: Observable<Event>;\r\n    private clickBody$: Observable<Event>;\r\n    private windowLoad$: Observable<Event>;\r\n    private windowPopstate$: Observable<Event>;\r\n    private isScrollingToAnchor: HTMLElement;\r\n\r\n    static setup(selector: string = moduleSelector): void {\r\n        Array.from(document.querySelectorAll(selector)).filter((node: HTMLElement) => !node.dataset.moduleInitialized).forEach((element: HTMLElement) => {\r\n            new AnchorNavigation(element);\r\n            element.dataset.moduleInitialized = 'true';\r\n        });\r\n    }\r\n\r\n    constructor(public element: HTMLElement) {\r\n        this.scrollDirection = new ScrollDirection(element);\r\n        this.scrollBody$ = fromEvent(window, 'scroll');\r\n        this.clickBody$ = fromEvent(document, 'click');\r\n        this.windowLoad$ = fromEvent(window, 'load');\r\n        this.windowPopstate$ = fromEvent(window, 'popstate');\r\n\r\n        this.init();\r\n    }\r\n\r\n    private init(): AnchorNavigation {\r\n        const navigation = this.buildNavigation(this.sections);\r\n        if (!navigation) {\r\n            this.element.remove();\r\n            return this;\r\n        } else {\r\n            this.element.removeAttribute('hidden');\r\n        };\r\n\r\n        horizontalScrolling(<HTMLElement>this.element.querySelector('.nx-scroll-wrapper__inner'));\r\n\r\n        this.subscribeToScrollOnBody();\r\n        if (!this.scrollToAnchorSectionOnLoad()) this.windowLoad$.pipe().subscribe(() => this.scrollToAnchorSectionOnLoad());\r\n        this.clickNav$.subscribe(({ target }: Event) => this.scrollToActiveSection(<HTMLElement>target));\r\n        this.windowPopstate$.pipe().subscribe(() => this.scrollToAnchorSectionOnLoad());\r\n        this.clickBody$.subscribe((e) => this.onDefaultAnchorClick(e));\r\n        if (this.isMainNavigationBurgerType()) this.element.querySelector('.nx-anchor-navigation')?.classList.add('nx-anchor-navigation--navigation-type-burger');\r\n\r\n        this.correctPositionOnScrollEnd();\r\n\r\n        return this;\r\n    }\r\n\r\n    private correctPositionOnScrollEnd() {\r\n        let isFirstScroll = true;\r\n\r\n        window.addEventListener('scrollend', () => {\r\n            if (this.isScrollingToAnchor) {\r\n                if (isFirstScroll) {\r\n                    this.scrollToSection(this.isScrollingToAnchor);\r\n                    isFirstScroll = false;\r\n                } else {\r\n                    this.scrollToSection(this.isScrollingToAnchor);\r\n                    this.isScrollingToAnchor = null;\r\n                    isFirstScroll = true;\r\n                }\r\n            }\r\n        });\r\n    }\r\n\r\n    private isMainNavigationBurgerType(): boolean {\r\n        return document.body.querySelector('header.nx-mob-burger-nav--activated') !== null;\r\n    }\r\n\r\n    private buildNavigation(sections: HTMLElement[]): AnchorNavigation {\r\n        const container = this.element.querySelector('.nx-scroll-wrapper__inner'),\r\n            markUp = sections.map((s, counter) => {\r\n                const anchorId = s.getAttribute('data-anchor-id'),\r\n                    innerText = s.getAttribute('data-anchor-text');\r\n                if (!innerText || innerText === \"\" || !anchorId) return;\r\n                s.setAttribute('data-anchor-content', '')\r\n                return `<a class=\"nx-anchor-link nx-font-heading-6\" data-href=\"${anchorId}\" title=\"${innerText}\" tabindex=\"0\">${innerText}</a>`;\r\n            }).join('');\r\n\r\n        if (!markUp) return null;\r\n\r\n        container.innerHTML = markUp;\r\n\r\n        this.initAnchorLinks();\r\n\r\n        this.clickNav$ = fromEvent(container, 'click').pipe(\r\n            filter(({ target }: Event) => (<HTMLElement>target).tagName === 'A'),\r\n        );\r\n\r\n        return this;\r\n    }\r\n\r\n    private subscribeToScrollOnBody(): AnchorNavigation {\r\n        this.scrollBody$.pipe(\r\n            startWith(null),\r\n            takeUntil(this.clickNav$),\r\n        ).subscribe(() => this.setStickyNavigation());\r\n        return this;\r\n    }\r\n\r\n    private initAnchorLinks() {\r\n        this.navLinks = Array.from(this.element.querySelectorAll('.nx-anchor-link'));\r\n        this.triggerClickOnEnterForNavLinks();\r\n    }\r\n\r\n    private triggerClickOnEnterForNavLinks() {\r\n        this.navLinks.forEach(link => {\r\n            link.addEventListener(\"keypress\", (e) => {\r\n                if (e.key === \"Enter\") {\r\n                    link.click();\r\n                }\r\n            });\r\n        });\r\n    }\r\n\r\n    private getAnchorSections() {\r\n        return Array.from(document.querySelectorAll('[data-anchor-content]'));\r\n    }\r\n\r\n    private onDefaultAnchorClick(e) {\r\n        const target = (<HTMLElement>e.target).tagName === 'A' ? <HTMLElement>e.target : (<HTMLElement>e.target).closest('a');\r\n        const targetID = (target) ? (<HTMLAnchorElement>target).getAttribute('href') : false;\r\n\r\n        if (targetID && isSelectorValid(targetID)) {\r\n            e.preventDefault();\r\n            this.scrollToActiveSection(target as HTMLAnchorElement);\r\n        }\r\n    }\r\n\r\n    private isOnTopViewport(element: HTMLElement, top: number = 0): boolean {\r\n        const elementRect = element.getBoundingClientRect(),\r\n            offsetHeight = document.documentElement.offsetHeight;\r\n        return Math.floor(elementRect.top) <= top &&\r\n            Math.floor(elementRect.top) < offsetHeight &&\r\n            Math.floor(elementRect.bottom) > top;\r\n    }\r\n\r\n    private getActiveSection(): HTMLElement {\r\n        const arr = Array.from(this.navLinks).filter(link => {\r\n            let { href: sectionId } = link.dataset;\r\n            let section = document.getElementById(sectionId);\r\n\r\n            return this.isOnTopViewport(section, this.getCorrectionOnScroll());\r\n        });\r\n\r\n        return arr[0];\r\n    }\r\n\r\n    private setActiveSection(): HTMLElement {\r\n        const activeSection = this.getActiveSection();\r\n        removeClassFromList(this.navLinks, 'nx-active');\r\n\r\n        if (activeSection) {\r\n            this.scrollToHorizontal(<HTMLElement>this.element.querySelector('.nx-scroll-wrapper__inner'), activeSection);\r\n            activeSection.classList.add('nx-active');\r\n        }\r\n\r\n        return activeSection;\r\n    }\r\n\r\n    private getCorrectionOnScroll() {\r\n        const anchorNavHeight = getElementHeight(this.element);\r\n        return this.scrollDirection.scrollingFlag ? anchorNavHeight + this.getBreadcrumbHeight() : getElementHeight(this.element);\r\n    }\r\n\r\n    private getBreadcrumbHeight(): number {\r\n        let breadcrumb = <HTMLElement>document.querySelector('.nx-breadcrumb');\r\n        return breadcrumb ? getElementHeight(breadcrumb) : 0;\r\n    }\r\n\r\n    private scrollToActiveSection(targetLink: HTMLElement): AnchorNavigation {\r\n        const clickedSection = document.getElementById(targetLink.dataset.href) || document.querySelector(targetLink.getAttribute('href'));\r\n        if (Math.round(clickedSection.getBoundingClientRect().top) !== this.getCorrectionOnScroll()) {\r\n            fromEvent(clickedSection, 'niveax:animationend').pipe(first()).subscribe(() => this.subscribeToScrollOnBody());\r\n        } else {\r\n            this.subscribeToScrollOnBody();\r\n        }\r\n\r\n        const tabItem = clickedSection.closest('.nx-tab-container-item')\r\n\r\n        if (tabItem) {\r\n            clickedSection.closest('.nx-tabs-container').dispatchEvent(new CustomEvent('niveax:openTab', {\r\n                detail: {\r\n                    tabNode: tabItem\r\n                }\r\n            }));\r\n        }\r\n\r\n        this.scrollToSection(clickedSection);\r\n\r\n        this.subscribeToScrollOnBody();\r\n\r\n        this.scrollToHorizontal(<HTMLElement>this.element.querySelector('.nx-scroll-wrapper__inner'), targetLink);\r\n        this.setKeyboardFocusToActiveSection(clickedSection);\r\n\r\n        return this;\r\n    }\r\n\r\n    private setKeyboardFocusToActiveSection(activeSection: HTMLElement) {\r\n        activeSection.setAttribute('tabindex', '-1');\r\n        activeSection.focus();\r\n    }\r\n\r\n    private scrollToSection(section: HTMLElement) {\r\n        this.isScrollingToAnchor = section;\r\n        const sectionPositionTop = section.getBoundingClientRect().top;\r\n        let offset = this.getScrollOffset();\r\n\r\n        requestAnimationFrame(() => {\r\n            window.scrollBy({\r\n                top: sectionPositionTop - offset,\r\n                left: 0,\r\n                behavior: \"smooth\"\r\n            });\r\n        });\r\n    }\r\n\r\n    private getScrollOffset(): number {\r\n        let offset = 0;\r\n\r\n        let breadcrumb = <HTMLElement>document.querySelector('.nx-breadcrumb');\r\n        if (breadcrumb && (getComputedStyle(breadcrumb).position === 'fixed' || getComputedStyle(breadcrumb).position === 'sticky')) {\r\n            const breadcrumbMaxHeight = getComputedStyle(breadcrumb).maxHeight;\r\n            if (breadcrumbMaxHeight !== '0' && breadcrumbMaxHeight !== '0px' && breadcrumbMaxHeight !== 'none') {\r\n                offset += getElementHeight(breadcrumb);\r\n            }\r\n        }\r\n\r\n        let mainHeader = <HTMLElement>document.querySelector('.nx-mob-burger-nav__wrapper');\r\n        if (mainHeader && (getComputedStyle(mainHeader).display !== 'none')) {\r\n            offset += getElementHeight(mainHeader);\r\n        }\r\n\r\n        let anchorNavigationElement = <HTMLElement>this.element.querySelector('.nx-anchor-navigation');\r\n        if (anchorNavigationElement && (getComputedStyle(anchorNavigationElement).position === 'fixed' || getComputedStyle(anchorNavigationElement).position === 'sticky')) {\r\n            offset += getElementHeight(anchorNavigationElement);\r\n        }\r\n\r\n        return offset;\r\n    }\r\n\r\n    private isStickyNavigation(): boolean {\r\n        const firstScrollElementTop = this.element.getBoundingClientRect().top;\r\n        const lastScrollElement = getLastItemInArray(this.getAnchorSections());\r\n        const lastElementBottom = lastScrollElement.getBoundingClientRect().bottom;\r\n        return firstScrollElementTop <= this.getBreadcrumbHeight() && lastElementBottom > 0;\r\n    }\r\n\r\n    private setStickyNavigation(): AnchorNavigation {\r\n        if (this.isStickyNavigation()) {\r\n            this.element.querySelector('.nx-anchor-navigation').classList.add('nx-anchor-navigation--sticky');\r\n            this.setActiveSection();\r\n        } else {\r\n            this.element.querySelector('.nx-anchor-navigation').classList.remove('nx-anchor-navigation--sticky');\r\n            removeClassFromList(this.navLinks, 'nx-active');\r\n        }\r\n        return this;\r\n    }\r\n\r\n    scrollToHorizontal(parentElement: HTMLElement, element: HTMLElement) {\r\n        if (isIOS()) {\r\n            smoothscroll.polyfill();\r\n        }\r\n\r\n        parentElement.scrollTo({\r\n            top: 0,\r\n            left: element.offsetLeft - 20,\r\n            behavior: 'smooth'\r\n        });\r\n    }\r\n\r\n    private scrollToAnchorSectionOnLoad(): boolean {\r\n        const hash: string = window.location.hash.substring(1),\r\n            section: HTMLElement = document.getElementById(`${hash}`);\r\n\r\n        if (hash && hash.indexOf('layer') === -1 && !!section) {\r\n            this.scrollToSection(section);\r\n\r\n            return true;\r\n        } else {\r\n            return false;\r\n        }\r\n    }\r\n}\r\n\r\n// Hot Module Replacement\r\nif (module.hot) {\r\n    let nodesCache: HMRNodes[] = Array.from(document.querySelectorAll(moduleSelector)).map((element: Node) => ({ nodeToReplace: element, nodeOrigin: element.cloneNode(true) }));\r\n\r\n    AnchorNavigation.setup(moduleSelector);\r\n\r\n    module.hot.accept(() => {\r\n        AnchorNavigation.setup(moduleSelector);\r\n    });\r\n    module.hot.dispose(() => {\r\n        nodesCache.forEach(({ nodeToReplace, nodeOrigin }) => { nodeToReplace = nodeToReplace.parentElement.replaceChild(nodeOrigin.cloneNode(true), nodeToReplace) });\r\n    });\r\n} else {\r\n    AnchorNavigation.setup(moduleSelector);\r\n}","/// <reference path=\"../typings/niveax.d.ts\"/>\r\n\r\nexport default class ScrollDirection {\r\n    element: HTMLElement;\r\n    scrollingUpClass: string;\r\n    scrollingDownClass: string;\r\n    scrollingFlag: boolean;\r\n    lastPageYOffset: number;\r\n\r\n    constructor(element: HTMLElement, scrollingUpClass: string = 'nx-motion-scrolling--up', scrollingDownClass: string = 'nx-motion-scrolling--down') {\r\n        this.element = element;\r\n        this.scrollingUpClass = scrollingUpClass;\r\n        this.scrollingDownClass = scrollingDownClass;\r\n        this.scrollingFlag;\r\n        this.init();\r\n    }\r\n\r\n    private init() {\r\n        NiveaX.addToEventStore('scroll', (e) => this.scroll(e), window);\r\n    }\r\n\r\n    scroll(e) {\r\n        this.toggleScrollClasses(this.lastPageYOffset);\r\n        this.lastPageYOffset = pageYOffset;\r\n    }\r\n\r\n    private toggleScrollClasses(lastPageYOffset: number) {\r\n        if (Math.abs(pageYOffset - lastPageYOffset) < 40) return;\r\n\r\n        if (window.scrollY < 0) return;\r\n\r\n        if (pageYOffset < lastPageYOffset) {\r\n            this.element.classList.add(this.scrollingUpClass);\r\n            this.element.classList.remove(this.scrollingDownClass);\r\n            this.scrollingFlag = true;\r\n        } else if (pageYOffset > lastPageYOffset) {\r\n            this.element.classList.add(this.scrollingDownClass);\r\n            this.element.classList.remove(this.scrollingUpClass);\r\n            this.scrollingFlag = false;\r\n        }\r\n\r\n    }\r\n}","/* 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 + ROUNDING_TOLERANCE < el.scrollHeight;\n      }\n\n      if (axis === 'X') {\n        return el.clientWidth + ROUNDING_TOLERANCE < el.scrollWidth;\n      }\n    }\n\n    /**\n     * indicates if an element has a scrollable overflow property in the axis\n     * @method canOverflow\n     * @param {Node} el\n     * @param {String} axis\n     * @returns {Boolean}\n     */\n    function canOverflow(el, axis) {\n      var overflowValue = w.getComputedStyle(el, null)['overflow' + axis];\n\n      return overflowValue === 'auto' || overflowValue === 'scroll';\n    }\n\n    /**\n     * indicates if an element can be scrolled in either axis\n     * @method isScrollable\n     * @param {Node} el\n     * @param {String} axis\n     * @returns {Boolean}\n     */\n    function isScrollable(el) {\n      var isScrollableY = hasScrollableSpace(el, 'Y') && canOverflow(el, 'Y');\n      var isScrollableX = hasScrollableSpace(el, 'X') && canOverflow(el, 'X');\n\n      return isScrollableY || isScrollableX;\n    }\n\n    /**\n     * finds scrollable parent of an element\n     * @method findScrollableParent\n     * @param {Node} el\n     * @returns {Node} el\n     */\n    function findScrollableParent(el) {\n      while (el !== d.body && isScrollable(el) === false) {\n        el = el.parentNode || el.host;\n      }\n\n      return el;\n    }\n\n    /**\n     * self invoked function that, given a context, steps through scrolling\n     * @method step\n     * @param {Object} context\n     * @returns {undefined}\n     */\n    function step(context) {\n      var time = now();\n      var value;\n      var currentX;\n      var currentY;\n      var elapsed = (time - context.startTime) / SCROLL_TIME;\n\n      // avoid elapsed times higher than one\n      elapsed = elapsed > 1 ? 1 : elapsed;\n\n      // apply easing to elapsed time\n      value = ease(elapsed);\n\n      currentX = context.startX + (context.x - context.startX) * value;\n      currentY = context.startY + (context.y - context.startY) * value;\n\n      context.method.call(context.scrollable, currentX, currentY);\n\n      // scroll more if we have not reached our destination\n      if (currentX !== context.x || currentY !== context.y) {\n        w.requestAnimationFrame(step.bind(w, context));\n      }\n    }\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 + this.scrollLeft\n            : ~~arguments[0] + this.scrollLeft,\n          arguments[0].top !== undefined\n            ? ~~arguments[0].top + this.scrollTop\n            : ~~arguments[1] + this.scrollTop\n        );\n\n        return;\n      }\n\n      this.scroll({\n        left: ~~arguments[0].left + this.scrollLeft,\n        top: ~~arguments[0].top + this.scrollTop,\n        behavior: arguments[0].behavior\n      });\n    };\n\n    // Element.prototype.scrollIntoView\n    Element.prototype.scrollIntoView = function() {\n      // avoid smooth behavior if not required\n      if (shouldBailOut(arguments[0]) === true) {\n        original.scrollIntoView.call(\n          this,\n          arguments[0] === undefined ? true : arguments[0]\n        );\n\n        return;\n      }\n\n      // LET THE SMOOTHNESS BEGIN!\n      var scrollableParent = findScrollableParent(this);\n      var parentRects = scrollableParent.getBoundingClientRect();\n      var clientRects = this.getBoundingClientRect();\n\n      if (scrollableParent !== d.body) {\n        // reveal element inside parent\n        smoothScroll.call(\n          this,\n          scrollableParent,\n          scrollableParent.scrollLeft + clientRects.left - parentRects.left,\n          scrollableParent.scrollTop + clientRects.top - parentRects.top\n        );\n\n        // reveal parent in viewport unless is fixed\n        if (w.getComputedStyle(scrollableParent).position !== 'fixed') {\n          w.scrollBy({\n            left: parentRects.left,\n            top: parentRects.top,\n            behavior: 'smooth'\n          });\n        }\n      } else {\n        // reveal element in viewport\n        w.scrollBy({\n          left: clientRects.left,\n          top: clientRects.top,\n          behavior: 'smooth'\n        });\n      }\n    };\n  }\n\n  if (typeof exports === 'object' && typeof module !== 'undefined') {\n    // commonjs\n    module.exports = { polyfill: polyfill };\n  } else {\n    // global\n    polyfill();\n  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