@kuzorov/smoothscroll-polyfill/dist/smoothscroll.min.js

Smooth Scroll behavior polyfill

!function(){"use strict";!function(){var n=window,f=document;if(!("scrollBehavior"in f.documentElement.style&&!0!==n.__forceSmoothScrollPolyfill__)){var o,t=n.HTMLElement||n.Element,i=468,a={scroll:n.scroll||n.scrollTo,scrollBy:n.scrollBy,elementScroll:t.prototype.scroll||d,scrollIntoView:t.prototype.scrollIntoView},p=n.performance&&n.performance.now?n.performance.now.bind(n.performance):Date.now,l=(o=n.navigator.userAgent,new RegExp(["MSIE ","Trident/","Edge/"].join("|")).test(o)?1:0);n.scroll=n.scrollTo=function(){void 0!==arguments[0]&&(!0!==e(arguments[0])?c.call(n,f.body,void 0!==arguments[0].left?~~arguments[0].left:n.scrollX||n.pageXOffset,void 0!==arguments[0].top?~~arguments[0].top:n.scrollY||n.pageYOffset):a.scroll.call(n,void 0!==arguments[0].left?arguments[0].left:"object"!=typeof arguments[0]?arguments[0]:n.scrollX||n.pageXOffset,void 0!==arguments[0].top?arguments[0].top:void 0!==arguments[1]?arguments[1]:n.scrollY||n.pageYOffset))},n.scrollBy=function(){void 0!==arguments[0]&&(e(arguments[0])?a.scrollBy.call(n,void 0!==arguments[0].left?arguments[0].left:"object"!=typeof arguments[0]?arguments[0]:0,void 0!==arguments[0].top?arguments[0].top:void 0!==arguments[1]?arguments[1]:0):c.call(n,f.body,~~arguments[0].left+(n.scrollX||n.pageXOffset),~~arguments[0].top+(n.scrollY||n.pageYOffset)))},t.prototype.scroll=t.prototype.scrollTo=function(){if(void 0!==arguments[0])if(!0!==e(arguments[0])){var o=arguments[0].left,t=arguments[0].top;c.call(this,this,void 0===o?this.scrollLeft:~~o,void 0===t?this.scrollTop:~~t)}else{if("number"==typeof arguments[0]&&void 0===arguments[1])throw new SyntaxError("Value could not be converted");a.elementScroll.call(this,void 0!==arguments[0].left?~~arguments[0].left:"object"!=typeof arguments[0]?~~arguments[0]:this.scrollLeft,void 0!==arguments[0].top?~~arguments[0].top:void 0!==arguments[1]?~~arguments[1]:this.scrollTop)}},t.prototype.scrollBy=function(){void 0!==arguments[0]&&(!0!==e(arguments[0])?this.scroll({left:~~arguments[0].left+this.scrollLeft,top:~~arguments[0].top+this.scrollTop,behavior:arguments[0].behavior}):a.elementScroll.call(this,void 0!==arguments[0].left?~~arguments[0].left+this.scrollLeft:~~arguments[0]+this.scrollLeft,void 0!==arguments[0].top?~~arguments[0].top+this.scrollTop:~~arguments[1]+this.scrollTop))},t.prototype.scrollIntoView=function(){if(!0!==e(arguments[0])){var o=function(o){for(;o!==f.body&&!1===(void 0,l=r(t=o,"Y")&&s(t,"Y"),e=r(t,"X")&&s(t,"X"),l||e);)o=o.parentNode||o.host;var t,l,e;return o}(this),t=o.getBoundingClientRect(),l=this.getBoundingClientRect();o!==f.body?(c.call(this,o,o.scrollLeft+l.left-t.left,o.scrollTop+l.top-t.top),"fixed"!==n.getComputedStyle(o).position&&n.scrollBy({left:t.left,top:t.top,behavior:"smooth"})):n.scrollBy({left:l.left,top:l.top,behavior:"smooth"})}else a.scrollIntoView.call(this,void 0===arguments[0]||arguments[0])}}function d(o,t){this.scrollLeft=o,this.scrollTop=t}function e(o){if(null===o||"object"!=typeof o||void 0===o.behavior||"auto"===o.behavior||"instant"===o.behavior)return!0;if("object"==typeof o&&"smooth"===o.behavior)return!1;throw new TypeError("behavior member of ScrollOptions "+o.behavior+" is not a valid value for enumeration ScrollBehavior.")}function r(o,t){return"Y"===t?o.clientHeight+l<o.scrollHeight:"X"===t?o.clientWidth+l<o.scrollWidth:void 0}function s(o,t){var l=n.getComputedStyle(o,null)["overflow"+t];return"auto"===l||"scroll"===l}function v(o){var t,l,e,r=(p()-o.startTime)/i;t=function(o){return.5*(1-Math.cos(Math.PI*o))}(r=1<r?1:r),l=o.startX+(o.x-o.startX)*t,e=o.startY+(o.y-o.startY)*t,o.method.call(o.scrollable,l,e),l===o.x&&e===o.y||n.requestAnimationFrame(v.bind(n,o))}function c(o,t,l){var e,r,i,s,c=p();s=o===f.body?(r=(e=n).scrollX||n.pageXOffset,i=n.scrollY||n.pageYOffset,a.scroll):(r=(e=o).scrollLeft,i=o.scrollTop,d),v({scrollable:e,method:s,startTime:c,startX:r,startY:i,x:t,y:l})}}()}();