☰

YouTube JS Engine Tamer

To enhance YouTube performance by modifying YouTube JS Engine

当前为 2023-08-30 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name        YouTube JS Engine Tamer
  3. // @namespace   UserScripts
  4. // @match       https://www.youtube.com/*
  5. // @version     0.4.3
  6. // @license     MIT
  7. // @author      CY Fung
  8. // @icon        https://github.com/cyfung1031/userscript-supports/raw/main/icons/yt-engine.png
  9. // @description To enhance YouTube performance by modifying YouTube JS Engine
  10. // @grant       none
  11. // @run-at      document-start
  12. // @unwrap
  13. // @inject-into page
  14. // @allFrames   true
  15. // ==/UserScript==
  16.  
  17. (() => {
  18.  
  19.   const NATIVE_CANVAS_ANIMATION = true; // for #cinematics
  20.   const FIX_schedulerInstanceInstance_ = true;
  21.   const FIX_yt_player = true;
  22.   const FIX_Animation_n_timeline = true;
  23.   const NO_PRELOAD_GENERATE_204 = false;
  24.   const CHANGE_appendChild = true;
  25.  
  26.   // << if FIX_yt_player >>
  27.  
  28.   // credit to @nopeless (https://greasyfork.org/scripts/471489-youtube-player-perf/)
  29.   const PERF_471489_ = true;
  30.   // PERF_471489_ is not exactly the same to Youtube Player perf v0.7
  31.   // This script uses a much gentle way to tamer the JS engine instead.
  32.  
  33.   // << end >>
  34.  
  35.   const steppingScaleN = 200; // transform: scaleX(k/N); 0<k<N
  36.  
  37.   const Promise = (async () => { })().constructor;
  38.  
  39.   let isMainWindow = false;
  40.   try {
  41.     isMainWindow = window.document === window.top.document
  42.   } catch (e) { }
  43.  
  44.   let NO_PRELOAD_GENERATE_204_BYPASS = NO_PRELOAD_GENERATE_204 ? false : true;
  45.  
  46.   const onRegistryReady = (callback) => {
  47.     if (typeof customElements === 'undefined') {
  48.       if (!('__CE_registry' in document)) {
  49.         // https://github.com/webcomponents/polyfills/
  50.         Object.defineProperty(document, '__CE_registry', {
  51.           get() {
  52.             // return undefined
  53.           },
  54.           set(nv) {
  55.             if (typeof nv == 'object') {
  56.               delete this.__CE_registry;
  57.               this.__CE_registry = nv;
  58.               this.dispatchEvent(new CustomEvent(EVENT_KEY_ON_REGISTRY_READY));
  59.             }
  60.             return true;
  61.           },
  62.           enumerable: false,
  63.           configurable: true
  64.         })
  65.       }
  66.       let eventHandler = (evt) => {
  67.         document.removeEventListener(EVENT_KEY_ON_REGISTRY_READY, eventHandler, false);
  68.         const f = callback;
  69.         callback = null;
  70.         eventHandler = null;
  71.         f();
  72.       };
  73.       document.addEventListener(EVENT_KEY_ON_REGISTRY_READY, eventHandler, false);
  74.     } else {
  75.       callback();
  76.     }
  77.   };
  78.  
  79.   const getZq = (_yt_player) => {
  80.  
  81.     const w = 'Zq';
  82.  
  83.     let arr = [];
  84.  
  85.     for (const [k, v] of Object.entries(_yt_player)) {
  86.  
  87.       const p = typeof v === 'function' ? v.prototype : 0;
  88.       if (p
  89.         && typeof p.start === 'function' && p.start.length === 0
  90.         && typeof p.isActive === 'function' && p.isActive.length === 0
  91.         && typeof p.stop === 'function' && p.stop.length === 0
  92.         && !p.isComplete && !p.getStatus && !p.getResponseHeader && !p.getLastError
  93.         && !p.send && !p.abort
  94.         && !p.sample && !p.initialize && !p.fail && !p.getName
  95.         // && !p.dispose && !p.isDisposed
  96.  
  97.       ) {
  98.         arr = addProtoToArr(_yt_player, k, arr) || arr;
  99.  
  100.  
  101.       }
  102.  
  103.     }
  104.  
  105.     if (arr.length === 0) {
  106.  
  107.       console.warn(`Key does not exist. [${w}]`);
  108.     } else {
  109.  
  110.       console.log(`[${w}]`, arr);
  111.       return arr[0];
  112.     }
  113.  
  114.  
  115.  
  116.  
  117.   }
  118.  
  119.  
  120.   const getVG = (_yt_player) => {
  121.     const w = 'VG';
  122.  
  123.     let arr = [];
  124.  
  125.     for (const [k, v] of Object.entries(_yt_player)) {
  126.  
  127.       const p = typeof v === 'function' ? v.prototype : 0;
  128.       if (p
  129.         && typeof p.show === 'function' && p.show.length === 1
  130.         && typeof p.hide === 'function' && p.hide.length === 0
  131.         && typeof p.stop === 'function' && p.stop.length === 0) {
  132.  
  133.         arr = addProtoToArr(_yt_player, k, arr) || arr;
  134.  
  135.       }
  136.  
  137.     }
  138.  
  139.  
  140.     if (arr.length === 0) {
  141.  
  142.       console.warn(`Key does not exist. [${w}]`);
  143.     } else {
  144.  
  145.       console.log(`[${w}]`, arr);
  146.       return arr[0];
  147.     }
  148.  
  149.  
  150.  
  151.   }
  152.  
  153.  
  154.   const getzo = (_yt_player) => {
  155.     const w = 'zo';
  156.  
  157.     let arr = [];
  158.  
  159.     for (const [k, v] of Object.entries(_yt_player)) {
  160.  
  161.       if (
  162.         typeof v === 'function' && v.length === 3 && k.length < 3
  163.         && (v + "").includes("a.style[b]=c")
  164.       ) {
  165.  
  166.         arr.push(k);
  167.  
  168.       }
  169.  
  170.     }
  171.  
  172.  
  173.     if (arr.length === 0) {
  174.  
  175.       console.warn(`Key does not exist. [${w}]`);
  176.     } else {
  177.  
  178.       console.log(`[${w}]`, arr);
  179.       return arr[0];
  180.     }
  181.  
  182.   }
  183.  
  184.   const addProtoToArr = (parent, key, arr) => {
  185.  
  186.  
  187.     let isChildProto = false;
  188.     for (const sr of arr) {
  189.       if (parent[key].prototype instanceof parent[sr]) {
  190.         isChildProto = true;
  191.         break;
  192.       }
  193.     }
  194.  
  195.     if (isChildProto) return;
  196.  
  197.     arr = arr.filter(sr => {
  198.       if (parent[sr].prototype instanceof parent[key]) {
  199.         return false;
  200.       }
  201.       return true;
  202.     });
  203.  
  204.     arr.push(key);
  205.  
  206.     return arr;
  207.  
  208.  
  209.   }
  210.  
  211.   const getuG = (_yt_player) => {
  212.  
  213.     const w = 'uG';
  214.  
  215.     let arr = [];
  216.  
  217.     for (const [k, v] of Object.entries(_yt_player)) {
  218.  
  219.  
  220.       const p = typeof v === 'function' ? v.prototype : 0;
  221.  
  222.       if (p
  223.         && typeof p.createElement === 'function' && p.createElement.length === 2
  224.         && typeof p.detach === 'function' && p.detach.length === 0
  225.         && typeof p.update === 'function' && p.update.length === 1
  226.         && typeof p.updateValue === 'function' && p.updateValue.length === 2
  227.       ) {
  228.  
  229.         arr = addProtoToArr(_yt_player, k, arr) || arr;
  230.  
  231.       }
  232.  
  233.     }
  234.  
  235.  
  236.  
  237.  
  238.  
  239.     if (arr.length === 0) {
  240.  
  241.       console.warn(`Key does not exist. [${w}]`);
  242.     } else {
  243.  
  244.       console.log(`[${w}]`, arr);
  245.       return arr[0];
  246.     }
  247.  
  248.   }
  249.  
  250.  
  251.  
  252.   // << if FIX_schedulerInstanceInstance_ >>
  253.  
  254.   let idleFrom = Date.now() + 2700;
  255.   let slowMode = false;
  256.  
  257.   let ytEvented = false;
  258.  
  259.  
  260.   function setupEvents() {
  261.  
  262.     document.addEventListener('yt-navigate', () => {
  263.  
  264.       ytEvented = true;
  265.       slowMode = false;
  266.       idleFrom = Date.now() + 2700;
  267.  
  268.     });
  269.     document.addEventListener('yt-navigate-start', () => {
  270.  
  271.       ytEvented = true;
  272.       slowMode = false;
  273.       idleFrom = Date.now() + 2700;
  274.  
  275.     });
  276.  
  277.     document.addEventListener('yt-page-type-changed', () => {
  278.  
  279.       ytEvented = true;
  280.       slowMode = false;
  281.       idleFrom = Date.now() + 1700;
  282.  
  283.     });
  284.  
  285.  
  286.     document.addEventListener('yt-player-updated', () => {
  287.  
  288.       ytEvented = true;
  289.       slowMode = false;
  290.       idleFrom = Date.now() + 1700;
  291.  
  292.     });
  293.  
  294.  
  295.     document.addEventListener('yt-page-data-fetched', () => {
  296.  
  297.       ytEvented = true;
  298.       slowMode = false;
  299.       idleFrom = Date.now() + 1700;
  300.  
  301.     });
  302.  
  303.     document.addEventListener('yt-navigate-finish', () => {
  304.  
  305.       ytEvented = true;
  306.       slowMode = false;
  307.       let t = Date.now() + 700;
  308.       if (t > idleFrom) idleFrom = t;
  309.  
  310.     });
  311.  
  312.     document.addEventListener('yt-page-data-updated', () => {
  313.  
  314.       ytEvented = true;
  315.       slowMode = false;
  316.       let t = Date.now() + 700;
  317.       if (t > idleFrom) idleFrom = t;
  318.  
  319.     });
  320.  
  321.     document.addEventListener('yt-watch-comments-ready', () => {
  322.  
  323.       ytEvented = true;
  324.       slowMode = false;
  325.       let t = Date.now() + 700;
  326.       if (t > idleFrom) idleFrom = t;
  327.  
  328.     });
  329.   }
  330.  
  331.  
  332.   // << end >>
  333.  
  334.   const cleanContext = async (win) => {
  335.     const waitFn = requestAnimationFrame; // shall have been binded to window
  336.     try {
  337.       let mx = 16; // MAX TRIAL
  338.       const frameId = 'vanillajs-iframe-v1';
  339.       /** @type {HTMLIFrameElement | null} */
  340.       let frame = document.getElementById(frameId);
  341.       let removeIframeFn = null;
  342.       if (!frame) {
  343.         frame = document.createElement('iframe');
  344.         frame.id = 'vanillajs-iframe-v1';
  345.         frame.sandbox = 'allow-same-origin'; // script cannot be run inside iframe but API can be obtained from iframe
  346.         let n = document.createElement('noscript'); // wrap into NOSCRPIT to avoid reflow (layouting)
  347.         n.appendChild(frame);
  348.         while (!document.documentElement && mx-- > 0) await new Promise(waitFn); // requestAnimationFrame here could get modified by YouTube engine
  349.         const root = document.documentElement;
  350.         root.appendChild(n); // throw error if root is null due to exceeding MAX TRIAL
  351.         removeIframeFn = (setTimeout) => {
  352.           const removeIframeOnDocumentReady = (e) => {
  353.             e && win.removeEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
  354.             win = null;
  355.             setTimeout(() => {
  356.               n.remove();
  357.               n = null;
  358.             }, 200);
  359.           }
  360.           if (document.readyState !== 'loading') {
  361.             removeIframeOnDocumentReady();
  362.           } else {
  363.             win.addEventListener("DOMContentLoaded", removeIframeOnDocumentReady, false);
  364.           }
  365.         }
  366.       }
  367.       while (!frame.contentWindow && mx-- > 0) await new Promise(waitFn);
  368.       const fc = frame.contentWindow;
  369.       if (!fc) throw "window is not found."; // throw error if root is null due to exceeding MAX TRIAL
  370.       const { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval, requestIdleCallback, getComputedStyle } = fc;
  371.       const res = { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval, requestIdleCallback, getComputedStyle };
  372.       for (let k in res) res[k] = res[k].bind(win); // necessary
  373.       if (removeIframeFn) Promise.resolve(res.setTimeout).then(removeIframeFn);
  374.       res.animate = fc.HTMLElement.prototype.animate;
  375.       return res;
  376.     } catch (e) {
  377.       console.warn(e);
  378.       return null;
  379.     }
  380.   };
  381.  
  382.  
  383.   const promiseForCustomYtElementsReady = new Promise(onRegistryReady);
  384.  
  385.   cleanContext(window).then(__CONTEXT__ => {
  386.     if (!__CONTEXT__) return null;
  387.  
  388.     const { requestAnimationFrame, setTimeout, cancelAnimationFrame, setInterval, clearInterval, animate, requestIdleCallback, getComputedStyle } = __CONTEXT__;
  389.  
  390.  
  391.  
  392.     let rafPromiseForTickers = null;
  393.  
  394.     const getRafPromiseForTickers = () => rafPromiseForTickers || (rafPromiseForTickers = new Promise(resolve => {
  395.       requestAnimationFrame(hRes => {
  396.         rafPromiseForTickers = null;
  397.         resolve(hRes);
  398.       });
  399.     }));
  400.  
  401.     const getForegroundPromise = () => {
  402.       if (document.visibilityState === 'visible') {
  403.         return Promise.resolve();
  404.       } else {
  405.         return getRafPromiseForTickers();
  406.       }
  407.     };
  408.  
  409.     NO_PRELOAD_GENERATE_204_BYPASS || promiseForCustomYtElementsReady.then(()=>{
  410.       setTimeout(()=>{
  411.         NO_PRELOAD_GENERATE_204_BYPASS = true;
  412.       }, 1270);
  413.     });
  414.  
  415.     const promiseForTamerTimeout = new Promise(resolve => {
  416.       promiseForCustomYtElementsReady.then(() => {
  417.         customElements.whenDefined('ytd-app').then(() => {
  418.           setTimeout(resolve, 1200);
  419.         });
  420.       });
  421.       setTimeout(resolve, 3000);
  422.     });
  423.  
  424.  
  425.     class RAFHub {
  426.       constructor() {
  427.         /** @type {number} */
  428.         this.startAt = 8170;
  429.         /** @type {number} */
  430.         this.counter = 0;
  431.         /** @type {number} */
  432.         this.rid = 0;
  433.         /** @type {Map<number, FrameRequestCallback>} */
  434.         this.funcs = new Map();
  435.         const funcs = this.funcs;
  436.         /** @type {FrameRequestCallback} */
  437.         this.bCallback = this.mCallback.bind(this);
  438.         this.pClear = () => funcs.clear();
  439.       }
  440.       /** @param {DOMHighResTimeStamp} highResTime */
  441.       mCallback(highResTime) {
  442.         this.rid = 0;
  443.         Promise.resolve().then(this.pClear);
  444.         this.funcs.forEach(func => Promise.resolve(highResTime).then(func).catch(console.warn));
  445.       }
  446.       /** @param {FrameRequestCallback} f */
  447.       request(f) {
  448.         if (this.counter > 1e9) this.counter = 9;
  449.         let cid = this.startAt + (++this.counter);
  450.         this.funcs.set(cid, f);
  451.         if (this.rid === 0) this.rid = requestAnimationFrame(this.bCallback);
  452.         return cid;
  453.       }
  454.       /** @param {number} cid */
  455.       cancel(cid) {
  456.         cid = +cid;
  457.         if (cid > 0) {
  458.           if (cid <= this.startAt) {
  459.             return cancelAnimationFrame(cid);
  460.           }
  461.           if (this.rid > 0) {
  462.             this.funcs.delete(cid);
  463.             if (this.funcs.size === 0) {
  464.               cancelAnimationFrame(this.rid);
  465.               this.rid = 0;
  466.             }
  467.           }
  468.         }
  469.       }
  470.     }
  471.  
  472.  
  473.  
  474.     NATIVE_CANVAS_ANIMATION && (() => {
  475.  
  476.       HTMLCanvasElement.prototype.animate = animate;
  477.  
  478.       let cid = setInterval(() => {
  479.         HTMLCanvasElement.prototype.animate = animate;
  480.       }, 1);
  481.  
  482.       promiseForTamerTimeout.then(() => {
  483.         clearInterval(cid)
  484.       });
  485.  
  486.     })();
  487.  
  488.     CHANGE_appendChild && ( () => {
  489.  
  490.       HTMLElement.prototype.appendChild73 = HTMLElement.prototype.appendChild;
  491.       HTMLElement.prototype.appendChild = function (a) {
  492.         if (!NO_PRELOAD_GENERATE_204_BYPASS && document.head === this) {
  493.           for (let node = this.firstElementChild; node instanceof HTMLElement; node = node.nextElementSibling) {
  494.             if (node.nodeName === 'LINK' && node.rel === 'preload' && node.as === 'fetch' && !node.__m848__) {
  495.               node.__m848__ = 1;
  496.               node.rel = 'prefetch'; // see https://github.com/GoogleChromeLabs/quicklink
  497.             }
  498.           }
  499.         }
  500.         if (a instanceof DocumentFragment) {
  501.           if (a.firstElementChild === null) return a;
  502.         }
  503.         return this.appendChild73.apply(this, arguments)
  504.       }
  505.  
  506.  
  507.     })();
  508.  
  509.  
  510.     FIX_schedulerInstanceInstance_ && (async () => {
  511.  
  512.  
  513.       const schedulerInstanceInstance_ = await new Promise(resolve => {
  514.  
  515.         let cid = setInterval(() => {
  516.           let t = (((window || 0).ytglobal || 0).schedulerInstanceInstance_ || 0);
  517.           if (t) {
  518.  
  519.             clearInterval(cid);
  520.             resolve(t);
  521.           }
  522.         }, 1);
  523.         promiseForTamerTimeout.then(() => {
  524.           resolve(null)
  525.         });
  526.       });
  527.  
  528.       if (!schedulerInstanceInstance_) return;
  529.  
  530.  
  531.       if (!ytEvented) {
  532.         idleFrom = Date.now() + 2700;
  533.         slowMode = false; // integrity
  534.       }
  535.  
  536.       const checkOK = typeof schedulerInstanceInstance_.start === 'function' && !schedulerInstanceInstance_.start991 && !schedulerInstanceInstance_.stop && !schedulerInstanceInstance_.cancel && !schedulerInstanceInstance_.terminate && !schedulerInstanceInstance_.interupt;
  537.       if (checkOK) {
  538.  
  539.         schedulerInstanceInstance_.start991 = schedulerInstanceInstance_.start;
  540.  
  541.         let requestingFn = null;
  542.         let requestingArgs = null;
  543.         let requestingDT = 0;
  544.  
  545.         // let timerId = null;
  546.         const entries = [];
  547.         const f = function () {
  548.           requestingFn = this.fn;
  549.           requestingArgs = [...arguments];
  550.           requestingDT = Date.now();
  551.           entries.push({
  552.             fn: requestingFn,
  553.             args: requestingArgs,
  554.             t: requestingDT
  555.           });
  556.           // if (Date.now() < idleFrom) {
  557.           //   timerId = this.fn.apply(window, arguments);
  558.           // } else {
  559.           //   timerId = this.fn.apply(window, arguments);
  560.  
  561.           // }
  562.           // timerId = 12377;
  563.           return 12377;
  564.         }
  565.  
  566.  
  567.         const fakeFns = [
  568.           f.bind({ fn: requestAnimationFrame }),
  569.           f.bind({ fn: setInterval }),
  570.           f.bind({ fn: setTimeout }),
  571.           f.bind({ fn: requestIdleCallback })
  572.         ]
  573.  
  574.  
  575.  
  576.  
  577.         let timerResolve = null;
  578.         setInterval(() => {
  579.           timerResolve && timerResolve();
  580.           timerResolve = null;
  581.           if (!slowMode && Date.now() > idleFrom) slowMode = true;
  582.         }, 250);
  583.  
  584.         let mzt = 0;
  585.  
  586.         let fnSelectorProp = null;
  587.  
  588.         schedulerInstanceInstance_.start = function () {
  589.  
  590.           const mk1 = window.requestAnimationFrame
  591.           const mk2 = window.setInterval
  592.           const mk3 = window.setTimeout
  593.           const mk4 = window.requestIdleCallback
  594.  
  595.           const tThis = this['$$12378$$'] || this;
  596.  
  597.  
  598.           window.requestAnimationFrame = fakeFns[0]
  599.           window.setInterval = fakeFns[1]
  600.           window.setTimeout = fakeFns[2]
  601.           window.requestIdleCallback = fakeFns[3]
  602.  
  603.           fnSelectorProp = null;
  604.  
  605.  
  606.           tThis.start991.call(new Proxy(tThis, {
  607.             get(target, prop, receiver) {
  608.               if (prop === '$$12377$$') return true;
  609.               if (prop === '$$12378$$') return target;
  610.  
  611.               // console.log('get',prop)
  612.               return target[prop]
  613.             },
  614.             set(target, prop, value, receiver) {
  615.               // console.log('set', prop, value)
  616.  
  617.  
  618.               if (value >= 1 && value <= 4) fnSelectorProp = prop;
  619.               if (value === 12377 && fnSelectorProp) {
  620.  
  621.                 const originalSelection = target[fnSelectorProp];
  622.                 const timerIdProp = prop;
  623.  
  624.                 /*
  625.  
  626.  
  627.           case 1:
  628.               var a = this.K;
  629.               this.g = this.I ? window.requestIdleCallback(a, {
  630.                   timeout: 3E3
  631.               }) : window.setTimeout(a, ma);
  632.               break;
  633.           case 2:
  634.               this.g = window.setTimeout(this.M, this.N);
  635.               break;
  636.           case 3:
  637.               this.g = window.requestAnimationFrame(this.L);
  638.               break;
  639.           case 4:
  640.               this.g = window.setTimeout(this.J, 0)
  641.           }
  642.  
  643.           */
  644.  
  645.                 const doForegroundSlowMode = () => {
  646.  
  647.                   const tir = ++mzt;
  648.                   const f = requestingArgs[0];
  649.  
  650.  
  651.                   getForegroundPromise().then(() => {
  652.  
  653.  
  654.                     new Promise(r => {
  655.                       timerResolve = r
  656.                     }).then(() => {
  657.                       if (target[timerIdProp] === -tir) f();
  658.                     });
  659.  
  660.                   })
  661.  
  662.                   target[fnSelectorProp] = 931;
  663.                   target[prop] = -tir;
  664.                 }
  665.  
  666.                 if (target[fnSelectorProp] === 2 && requestingFn === setTimeout) {
  667.                   if (slowMode && !(requestingArgs[1] > 250)) {
  668.  
  669.                     doForegroundSlowMode();
  670.  
  671.                   } else {
  672.                     target[prop] = setTimeout.apply(window, requestingArgs);
  673.  
  674.                   }
  675.  
  676.                 } else if (target[fnSelectorProp] === 3 && requestingFn === requestAnimationFrame) {
  677.  
  678.                   if (slowMode) {
  679.  
  680.                     doForegroundSlowMode();
  681.  
  682.                   } else {
  683.                     target[prop] = requestAnimationFrame.apply(window, requestingArgs);
  684.                   }
  685.  
  686.  
  687.                 } else if (target[fnSelectorProp] === 4 && requestingFn === setTimeout && !requestingArgs[1]) {
  688.  
  689.                   const f = requestingArgs[0];
  690.                   const tir = ++mzt;
  691.                   Promise.resolve().then(() => {
  692.                     if (target[timerIdProp] === -tir) f();
  693.                   });
  694.                   target[fnSelectorProp] = 930;
  695.                   target[prop] = -tir;
  696.  
  697.                 } else if (target[fnSelectorProp] === 1 && (requestingFn === requestIdleCallback || requestingFn === setTimeout)) {
  698.  
  699.                   doForegroundSlowMode();
  700.  
  701.                 } else {
  702.                   // target[prop] = timerId;
  703.                   target[fnSelectorProp] = 0;
  704.                   target[prop] = 0;
  705.                 }
  706.  
  707.                 // *****
  708.                 // console.log('[[set]]', slowMode , prop, value, `fnSelectorProp: ${originalSelection} -> ${target[fnSelectorProp]}`)
  709.               } else {
  710.  
  711.                 target[prop] = value;
  712.               }
  713.               // console.log('set',prop,value)
  714.               return true;
  715.             }
  716.           }));
  717.  
  718.           fnSelectorProp = null;
  719.  
  720.  
  721.           window.requestAnimationFrame = mk1;
  722.           window.setInterval = mk2
  723.           window.setTimeout = mk3
  724.           window.requestIdleCallback = mk4;
  725.  
  726.  
  727.  
  728.         }
  729.  
  730.         schedulerInstanceInstance_.start.toString = function () {
  731.           return schedulerInstanceInstance_.start991.toString();
  732.         }
  733.  
  734.         // const funcNames = [...(schedulerInstanceInstance_.start + "").matchAll(/[\(,]this\.(\w{1,2})[,\)]/g)].map(e => e[1]).map(prop => ({
  735.         //   prop,
  736.         //   value: schedulerInstanceInstance_[prop],
  737.         //   type: typeof schedulerInstanceInstance_[prop]
  738.  
  739.         // }));
  740.         // console.log('fcc', funcNames)
  741.  
  742.  
  743.  
  744.  
  745.       }
  746.     })();
  747.  
  748.  
  749.     FIX_yt_player && (async () => {
  750.  
  751.  
  752.  
  753.       const rafHub = new RAFHub();
  754.  
  755.  
  756.       const _yt_player = await new Promise(resolve => {
  757.  
  758.         let cid = setInterval(() => {
  759.           let t = (((window || 0)._yt_player || 0) || 0);
  760.           if (t) {
  761.  
  762.             clearInterval(cid);
  763.             resolve(t);
  764.           }
  765.         }, 1);
  766.  
  767.         promiseForTamerTimeout.then(() => {
  768.           resolve(null)
  769.         });
  770.  
  771.       });
  772.  
  773.  
  774.  
  775.       if (!_yt_player || typeof _yt_player !== 'object') return;
  776.  
  777.  
  778.  
  779.       let keyZq = getZq(_yt_player);
  780.       let keyVG = getVG(_yt_player);
  781.       let buildVG = _yt_player[keyVG];
  782.       let u = new buildVG({
  783.         api: {},
  784.         element: document.createElement('noscript'),
  785.         api: {},
  786.         hide: () => { }
  787.       }, 250);
  788.       const timeDelayConstructor = u.delay.constructor; // g.br
  789.       // console.log(keyVG, u)
  790.       // buildVG.prototype.show = function(){}
  791.       // _yt_player[keyZq] = g.k
  792.  
  793.       if (!keyZq) return;
  794.  
  795.  
  796.       const g = _yt_player
  797.       let k = keyZq
  798.  
  799.       const gk = g[k];
  800.       if (typeof gk !== 'function') return;
  801.  
  802.       let dummyObject = new gk;
  803.       let nilFunc = () => { };
  804.  
  805.       let nilObj = {};
  806.  
  807.       // console.log(1111111111)
  808.  
  809.       let keyBoolD = '';
  810.       let keyWindow = '';
  811.       let keyFuncC = '';
  812.       let keyCidj = '';
  813.  
  814.       for (const [t, y] of Object.entries(dummyObject)) {
  815.         if (y instanceof Window) keyWindow = t;
  816.       }
  817.  
  818.       const dummyObjectProxyHandler = {
  819.         get(target, prop) {
  820.           let v = target[prop]
  821.           if (v instanceof Window && !keyWindow) {
  822.             keyWindow = t;
  823.           }
  824.           let y = typeof v === 'function' ? nilFunc : typeof v === 'object' ? nilObj : v;
  825.           if (prop === keyWindow) y = {
  826.             requestAnimationFrame(f) {
  827.               return 3;
  828.             },
  829.             cancelAnimationFrame() {
  830.  
  831.             }
  832.           }
  833.           if (!keyFuncC && typeof v === 'function' && !(prop in target.constructor.prototype)) {
  834.             keyFuncC = prop;
  835.           }
  836.           // console.log('[get]', prop, typeof target[prop])
  837.  
  838.  
  839.           return y;
  840.         },
  841.         set(target, prop, value) {
  842.  
  843.           if (typeof value === 'boolean' && !keyBoolD) {
  844.             keyBoolD = prop;
  845.           }
  846.           if (typeof value === 'number' && !keyCidj && value >= 2) {
  847.             keyCidj = prop;
  848.           }
  849.  
  850.           // console.log('[set]', prop, value)
  851.           target[prop] = value
  852.  
  853.           return true;
  854.         }
  855.       };
  856.  
  857.       dummyObject.start.call(new Proxy(dummyObject, dummyObjectProxyHandler))
  858.  
  859.       /*
  860.             console.log({
  861.               keyBoolD,
  862.               keyFuncC,
  863.               keyWindow,
  864.               keyCidj
  865.             })
  866.  
  867.             console.log( dummyObject[keyFuncC])
  868.  
  869.  
  870.             console.log(2222222222)
  871.       */
  872.  
  873.  
  874.  
  875.  
  876.       g[k].prototype.start = function () {
  877.         this.stop();
  878.         this[keyBoolD] = true;
  879.         this[keyCidj] = rafHub.request(this[keyFuncC]);
  880.       }
  881.         ;
  882.       g[k].prototype.stop = function () {
  883.         if (this.isActive() && this[keyCidj]) {
  884.           rafHub.cancel(this[keyCidj]);
  885.         }
  886.         this[keyCidj] = null
  887.       }
  888.  
  889.  
  890.       /*
  891.         g[k].start = function() {
  892.             this.stop();
  893.             this.D = true;
  894.             var a = requestAnimationFrame
  895.               , b = cancelAnimationFrame;
  896.             this.j =  a.call(this.B, this.C)
  897.         }
  898.         ;
  899.         g[k].stop = function() {
  900.             if (this.isActive()) {
  901.                 var a = requestAnimationFrame
  902.                   , b = cancelAnimationFrame;
  903.                 b.call(this.B, this.j)
  904.             }
  905.             this.j = null
  906.         }
  907.       */
  908.  
  909.  
  910.  
  911.       const keyzo = PERF_471489_ ? getzo(_yt_player) : null;
  912.  
  913.       if (keyzo) {
  914.  
  915.         k = keyzo
  916.  
  917.         const setCSSProp = (() => {
  918.  
  919.           let animationPropCapable = false;
  920.           try {
  921.             const propName = "--ibxpf"
  922.             const value = 2;
  923.             const keyframes = [{
  924.               [propName]: value
  925.             }];
  926.             window.CSS.registerProperty({
  927.               name: "--ibxpf",
  928.               syntax: "<number>",
  929.               inherits: false,
  930.               initialValue: 1,
  931.             });
  932.             animationPropCapable = '1' === `${getComputedStyle(document.documentElement).getPropertyValue('--ibxpf')}`
  933.           } catch (e) { }
  934.  
  935.           if (!animationPropCapable) {
  936.             return (element, cssProp, value) => {
  937.  
  938.  
  939.               element.style.setProperty(cssProp, value);
  940.  
  941.             }
  942.           }
  943.  
  944.           const propMaps = new Map();
  945.  
  946.           function setCustomCSSProperty(element, propName, value) {
  947.             let wm = propMaps.get(propName);
  948.             if (!wm) {
  949.  
  950.               try {
  951.                 window.CSS.registerProperty({
  952.                   name: propName,
  953.                   syntax: "*",
  954.                   inherits: false
  955.                 });
  956.               } catch (e) {
  957.                 console.warn(e);
  958.               }
  959.  
  960.               propMaps.set(propName, (wm = new WeakMap()));
  961.             }
  962.  
  963.             // Create the animation keyframes with the provided property and value
  964.             const keyframes = [{
  965.               [propName]: value
  966.             }];
  967.  
  968.             let currentAnimation = wm.get(element);
  969.             if (currentAnimation) {
  970.  
  971.               currentAnimation.effect.setKeyframes(keyframes);
  972.  
  973.             } else {
  974.  
  975.  
  976.  
  977.               // Set the animation on the element and immediately pause it
  978.               const animation = animate.call(element, keyframes, {
  979.                 duration: 1, // Very short duration as we just want to set the value
  980.                 fill: 'forwards',
  981.                 iterationStart: 1,
  982.                 iterations: 2,
  983.                 direction: 'alternate'
  984.               });
  985.  
  986.  
  987.               // animation.currentTime = 1;
  988.               animation.pause();
  989.  
  990.               wm.set(element, animation);
  991.  
  992.  
  993.             }
  994.  
  995.           }
  996.  
  997.           return setCustomCSSProperty;
  998.  
  999.  
  1000.         })();
  1001.  
  1002.  
  1003.         const attrUpdateFn = g[k];
  1004.         g['$$original$$' + k] = attrUpdateFn;
  1005.         g[k] = function (a, b, c) {
  1006.  
  1007.           // console.log(140000, a, b, c);
  1008.  
  1009.           let transformType = '';
  1010.           let transformValue = 0;
  1011.           let transformUnit = '';
  1012.  
  1013.           let byPassDefaultFn = false;
  1014.           if (b === "transform" && typeof c === 'string') {
  1015.  
  1016.             byPassDefaultFn = true;
  1017.  
  1018.             const aStyle = a.style;
  1019.  
  1020.             // let beforeMq = aStyle.getPropertyValue('--mq-transform');
  1021.             if (!(a instanceof HTMLElement)) return;
  1022.             if (c.length === 0) {
  1023.  
  1024.             } else if (c.startsWith('scalex(0.') || (c === 'scalex(0)' || c === 'scalex(1)')) {
  1025.               let p = c.substring(7, c.length - 1);
  1026.               let q = p.length >= 1 ? parseFloat(p) : -1;
  1027.               if (q > -1e-5 && q < 1 + 1e-5) {
  1028.                 transformType = 'scalex'
  1029.                 transformValue = q;
  1030.                 transformUnit = '';
  1031.               }
  1032.  
  1033.  
  1034.             } else if (c.startsWith('translateX(') && c.endsWith('px)')) {
  1035.  
  1036.               let p = c.substring(11, c.length - 3);
  1037.               let q = p.length >= 1 ? parseFloat(p) : NaN;
  1038.  
  1039.               if (typeof q === 'number' && !isNaN(q)) {
  1040.                 transformType = 'translateX'
  1041.                 transformValue = q;
  1042.                 transformUnit = 'px';
  1043.               }
  1044.  
  1045.  
  1046.             } else if (c.startsWith('scaley(0.') || (c === 'scaley(0)' || c === 'scaley(1)')) {
  1047.               let p = c.substring(7, c.length - 1);
  1048.               let q = p.length >= 1 ? parseFloat(p) : -1;
  1049.               if (q > -1e-5 && q < 1 + 1e-5) {
  1050.                 transformType = 'scaley'
  1051.                 transformValue = q;
  1052.                 transformUnit = '';
  1053.               }
  1054.  
  1055.  
  1056.             } else if (c.startsWith('translateY(') && c.endsWith('px)')) {
  1057.  
  1058.               let p = c.substring(11, c.length - 3);
  1059.               let q = p.length >= 1 ? parseFloat(p) : NaN;
  1060.  
  1061.               if (typeof q === 'number' && !isNaN(q)) {
  1062.                 transformType = 'translateY'
  1063.                 transformValue = q;
  1064.                 transformUnit = 'px';
  1065.               }
  1066.  
  1067.  
  1068.             }
  1069.  
  1070.             if (transformType) {
  1071.  
  1072.               if (transformType === 'scalex' || transformType === 'scaley') {
  1073.  
  1074.                 const q = transformValue;
  1075.  
  1076.  
  1077.                 /*
  1078.  
  1079.                 let vz = Math.round(steppingScaleN * q);
  1080.                 const customPropName = '--discrete-'+transformType
  1081.  
  1082.                 const currentValue = aStyle.getPropertyValue(customPropName);
  1083.  
  1084.                 const transform = (aStyle.transform || '');
  1085.                 const u = transform.includes(customPropName)
  1086.                 if (`${currentValue}` === `${vz}`) {
  1087.                   if (u) return;
  1088.                 }
  1089.  
  1090.  
  1091.                 setCSSProp(a,customPropName, vz);
  1092.                 // aStyle.setProperty(customPropName, vz)
  1093.  
  1094.                 let ck = '';
  1095.  
  1096.                 if (c.length === 9) ck = c;
  1097.                 else if (!u) ck = c.replace(/[.\d]+/, '0.5');
  1098.  
  1099.                 if (ck && beforeMq !== ck) {
  1100.                   aStyle.setProperty('--mq-transform', ck);
  1101.                 }
  1102.  
  1103.                 if (u) return;
  1104.                 c = `${transformType}(calc(var(--discrete-${transformType})/${steppingScaleN}))`;
  1105.  
  1106.  
  1107.  
  1108.                 */
  1109.  
  1110.                 const vz = +(Math.round(q * steppingScaleN) / steppingScaleN).toFixed(3);
  1111.  
  1112.                 c = `${transformType === 'scalex' ? 'scaleX' : 'scaleY'}(${vz})`
  1113.                 const cv = aStyle.transform;
  1114.  
  1115.                 // console.log(157, cv,c)
  1116.  
  1117.                 if (c === cv) return;
  1118.                 // console.log(257, cv,c)
  1119.  
  1120.                 aStyle.transform = c;
  1121.  
  1122.                 // return;
  1123.  
  1124.               } else if (transformType === 'translateX' || transformType === 'translateY') {
  1125.  
  1126.                 const q = transformValue;
  1127.  
  1128.                 /*
  1129.  
  1130.                 let vz = q.toFixed(1);
  1131.                 const customPropName = '--discrete-'+transformType
  1132.  
  1133.                 const aStyle = a.style;
  1134.                 const currentValue = (aStyle.getPropertyValue(customPropName) || '').replace('px', '');
  1135.  
  1136.  
  1137.                 const transform = (aStyle.transform || '');
  1138.                 const u = transform.includes(customPropName)
  1139.                 if (parseFloat(currentValue).toFixed(1) === vz) {
  1140.                   if (u) return;
  1141.                 }
  1142.  
  1143.                 setCSSProp(a,customPropName, vz + 'px');
  1144.                 // aStyle.setProperty(customPropName, vz + 'px')
  1145.  
  1146.                 let ck = '';
  1147.                 if (c.length === 15) ck = c;
  1148.                 else if (!u) ck = c.replace(/[.\d]+/, '0.5');
  1149.  
  1150.                 if (ck && beforeMq !== ck) {
  1151.                   aStyle.setProperty('--mq-transform', ck);
  1152.                 }
  1153.  
  1154.                 if (u) return;
  1155.                 c = `${transformType}(var(--discrete-${transformType}))`;
  1156.  
  1157.                 */
  1158.  
  1159.  
  1160.                 const vz = +q.toFixed(1);
  1161.  
  1162.                 c = `${transformType}(${vz}${transformUnit})`
  1163.                 const cv = aStyle.transform;
  1164.  
  1165.                 // console.log(158, cv,c)
  1166.  
  1167.                 if (c === cv) return;
  1168.                 // console.log(258, cv,c)
  1169.  
  1170.                 aStyle.transform = c;
  1171.  
  1172.                 // return;
  1173.  
  1174.               } else {
  1175.                 throw new Error();
  1176.               }
  1177.  
  1178.             } else {
  1179.               // if(beforeMq) a.style.setProperty('--mq-transform', '');
  1180.               const cv = aStyle.transform
  1181.               if (!c && !cv) return;
  1182.               else if (c === cv) return;
  1183.               aStyle.transform = c;
  1184.               // return;
  1185.             }
  1186.  
  1187.           } else if (b === "display") {
  1188.  
  1189.             const cv = a.style.display;
  1190.             if (!cv && !c) return;
  1191.             if (cv === c) return;
  1192.  
  1193.  
  1194.           } else if (b === "width") {
  1195.  
  1196.             const cv = a.style.width;
  1197.             if (!cv && !c) return;
  1198.             if (cv === c) return;
  1199.  
  1200.           }
  1201.  
  1202.           // console.log(130000, a, b, c);
  1203.  
  1204.           if (byPassDefaultFn) return;
  1205.           return attrUpdateFn.call(this, a, b, c);
  1206.         }
  1207.  
  1208.  
  1209.         /*
  1210.  
  1211.             g.zo = function(a, b, c) {
  1212.                 if ("string" === typeof b)
  1213.                     (b = yo(a, b)) && (a.style[b] = c);
  1214.                 else
  1215.                     for (var d in b) {
  1216.                         c = a;
  1217.                         var e = b[d]
  1218.                           , f = yo(c, d);
  1219.                         f && (c.style[f] = e)
  1220.                     }
  1221.             }
  1222.  
  1223.  
  1224.         */
  1225.  
  1226.  
  1227.       }
  1228.  
  1229.  
  1230.  
  1231.       const keyuG = PERF_471489_ ? getuG(_yt_player) : null;
  1232.  
  1233.       if (keyuG) {
  1234.  
  1235.         k = keyuG;
  1236.  
  1237.         const gk = g[k];
  1238.         const gkp = gk.prototype;
  1239.  
  1240.  
  1241.         /** @type { Map<string, WeakMap<any, any>> } */
  1242.         const ntLogs = new Map();
  1243.  
  1244.         if (typeof gkp.updateValue === 'function' && gkp.updateValue.length === 2 && !gkp.updateValue31) {
  1245.  
  1246.           gkp.updateValue31 = gkp.updateValue;
  1247.           gkp.updateValue = function (a, b) {
  1248.             if (typeof a !== 'string') return this.updateValue31(a, b);
  1249.  
  1250.             const element = this.element;
  1251.             if (!(element instanceof HTMLElement)) return this.updateValue31(a, b);
  1252.  
  1253.             let ntLog = ntLogs.get(a);
  1254.             if (!ntLog) ntLogs.set(a, (ntLog = new WeakMap()));
  1255.  
  1256.             let cache = ntLog.get(element);
  1257.             if (cache && cache.value === b) {
  1258.               return;
  1259.             }
  1260.             if (!cache) {
  1261.               this.__oldValueByUpdateValue__ = null;
  1262.               ntLog.set(element, cache = { value: b });
  1263.             } else {
  1264.               this.__oldValueByUpdateValue__ = cache.value;
  1265.               cache.value = b;
  1266.             }
  1267.  
  1268.  
  1269.             return this.updateValue31(a, b);
  1270.           }
  1271.  
  1272.  
  1273.           /*
  1274.             g.k.update = function(a) {
  1275.                 for (var b = g.u(Object.keys(a)), c = b.next(); !c.done; c = b.next())
  1276.                     c = c.value,
  1277.                     this.updateValue(c, a[c])
  1278.             }
  1279.             ;
  1280.             g.k.updateValue = function(a, b) {
  1281.                 (a = this.Td["{{" + a + "}}"]) && wG(this, a[0], a[1], b)
  1282.             }
  1283.           */
  1284.  
  1285.  
  1286.         }
  1287.  
  1288.  
  1289.       }
  1290.  
  1291.  
  1292.  
  1293.  
  1294.     })();
  1295.  
  1296.  
  1297.  
  1298.     FIX_Animation_n_timeline && (async () => {
  1299.  
  1300.  
  1301.       const timeline = await new Promise(resolve => {
  1302.  
  1303.         let cid = setInterval(() => {
  1304.           let t = (((document || 0).timeline || 0) || 0);
  1305.           if (t && typeof t._play === 'function') {
  1306.  
  1307.             clearInterval(cid);
  1308.             resolve(t);
  1309.           }
  1310.         }, 1);
  1311.  
  1312.         promiseForTamerTimeout.then(() => {
  1313.           resolve(null)
  1314.         });
  1315.  
  1316.       });
  1317.  
  1318.  
  1319.       const Animation = await new Promise(resolve => {
  1320.  
  1321.         let cid = setInterval(() => {
  1322.           let t = (((window || 0).Animation || 0) || 0);
  1323.           if (t && typeof t === 'function' && t.length === 2 && typeof t.prototype._updatePromises === 'function') {
  1324.  
  1325.             clearInterval(cid);
  1326.             resolve(t);
  1327.           }
  1328.         }, 1);
  1329.  
  1330.         promiseForTamerTimeout.then(() => {
  1331.           resolve(null)
  1332.         });
  1333.  
  1334.       });
  1335.  
  1336.       if (!timeline) return;
  1337.       if (!Animation) return;
  1338.  
  1339.       const aniProto = Animation.prototype;
  1340.  
  1341.       const getXroto = (x) => {
  1342.         try {
  1343.           return x.__proto__;
  1344.         } catch (e) { }
  1345.         return null;
  1346.       }
  1347.       const timProto = getXroto(timeline);
  1348.       if (!timProto) return;
  1349.       if (
  1350.         (
  1351.           typeof timProto.getAnimations === 'function' && typeof timProto.play === 'function' &&
  1352.           typeof timProto._discardAnimations === 'function' && typeof timProto._play === 'function' &&
  1353.           typeof timProto._updateAnimationsPromises === 'function' && !timProto.nofCQ &&
  1354.           typeof aniProto._updatePromises === 'function' && !aniProto.nofYH
  1355.         )
  1356.  
  1357.       ) {
  1358.  
  1359.         timProto.nofCQ = 1;
  1360.         aniProto.nofYH = 1;
  1361.  
  1362.         const originalAnimationsWithPromises = ((_updateAnimationsPromises) => {
  1363.  
  1364.  
  1365.           /*
  1366.             v.animationsWithPromises = v.animationsWithPromises.filter(function (c) {
  1367.               return c._updatePromises();
  1368.             });
  1369.           */
  1370.  
  1371.           const p = Array.prototype.filter;
  1372.  
  1373.           let res = null;
  1374.           Array.prototype.filter = function () {
  1375.  
  1376.             res = this;
  1377.             return this;
  1378.  
  1379.           };
  1380.  
  1381.           _updateAnimationsPromises.call({});
  1382.  
  1383.           Array.prototype.filter = p;
  1384.  
  1385.           if (res && typeof res.length === 'number') {
  1386.             /** @type {any[]} */
  1387.             const _res = res;
  1388.             return _res;
  1389.           }
  1390.  
  1391.  
  1392.           return null;
  1393.  
  1394.  
  1395.  
  1396.  
  1397.         })(timProto._updateAnimationsPromises);
  1398.  
  1399.         if (!originalAnimationsWithPromises || typeof originalAnimationsWithPromises.length !== 'number') return;
  1400.  
  1401.         // console.log('originalAnimationsWithPromises', originalAnimationsWithPromises)
  1402.  
  1403.         aniProto._updatePromises31 = aniProto._updatePromises;
  1404.  
  1405.         /*
  1406.         aniProto._updatePromises = function(){
  1407.           console.log('eff',this._oldPlayState, this.playState)
  1408.           return this._updatePromises31.apply(this, arguments)
  1409.         }
  1410.         */
  1411.  
  1412.         aniProto._updatePromises = function () {
  1413.           var oldPlayState = this._oldPlayState;
  1414.           var newPlayState = this.playState;
  1415.           // console.log('ett', oldPlayState, newPlayState)
  1416.           if (newPlayState !== oldPlayState) {
  1417.             this._oldPlayState = newPlayState;
  1418.             if (this._readyPromise) {
  1419.               if ("idle" == newPlayState) {
  1420.                 this._rejectReadyPromise();
  1421.                 this._readyPromise = void 0;
  1422.               } else if ("pending" == oldPlayState) {
  1423.                 this._resolveReadyPromise();
  1424.               } else if ("pending" == newPlayState) {
  1425.                 this._readyPromise = void 0;
  1426.               }
  1427.             }
  1428.             if (this._finishedPromise) {
  1429.               if ("idle" == newPlayState) {
  1430.                 this._rejectFinishedPromise();
  1431.                 this._finishedPromise = void 0;
  1432.               } else if ("finished" == newPlayState) {
  1433.                 this._resolveFinishedPromise();
  1434.               } else if ("finished" == oldPlayState) {
  1435.                 this._finishedPromise = void 0;
  1436.               }
  1437.             }
  1438.           }
  1439.           return this._readyPromise || this._finishedPromise;
  1440.         };
  1441.  
  1442.  
  1443.         let restartWebAnimationsNextTickFlag = false;
  1444.  
  1445.         const looperMethodT = () => {
  1446.  
  1447.           const runnerFn = (hRes) => {
  1448.             var b = timeline;
  1449.             b.currentTime = hRes;
  1450.             b._discardAnimations();
  1451.             if (0 == b._animations.length) {
  1452.               restartWebAnimationsNextTickFlag = false;
  1453.             } else {
  1454.               getRafPromiseForTickers().then(runnerFn);
  1455.             }
  1456.           }
  1457.  
  1458.           const restartWebAnimationsNextTick = () => {
  1459.             if (!restartWebAnimationsNextTickFlag) {
  1460.               restartWebAnimationsNextTickFlag = true;
  1461.               getRafPromiseForTickers().then(runnerFn);
  1462.             }
  1463.           }
  1464.  
  1465.           return { restartWebAnimationsNextTick }
  1466.         };
  1467.  
  1468.  
  1469.         const looperMethodN = () => {
  1470.  
  1471.           const acs = document.createElement('a-f');
  1472.           acs.id = 'a-f';
  1473.  
  1474.           const style = document.createElement('style');
  1475.           style.textContent = `
  1476.             @keyFrames aF1 {
  1477.               0% {
  1478.                 order: 0;
  1479.               }
  1480.               100% {
  1481.                 order: 6;
  1482.               }
  1483.             }
  1484.             #a-f[id] {
  1485.               visibility: collapse !important;
  1486.               position: fixed !important;
  1487.               top: -100px !important;
  1488.               left: -100px !important;
  1489.               margin:0 !important;
  1490.               padding:0 !important;
  1491.               outline:0 !important;
  1492.               border:0 !important;
  1493.               z-index:-1 !important;
  1494.               width: 0px !important;
  1495.               height: 0px !important;
  1496.               contain: strict !important;
  1497.               pointer-events: none !important;
  1498.               animation: 1ms steps(2) 0ms infinite alternate forwards running aF1 !important;
  1499.             }
  1500.           `;
  1501.           (document.head || document.documentElement).appendChild(style);
  1502.  
  1503.           document.documentElement.insertBefore(acs, document.documentElement.firstChild);
  1504.  
  1505.           const _onanimationiteration = function (evt) {
  1506.             const hRes = evt.timeStamp;
  1507.             var b = timeline;
  1508.             b.currentTime = hRes;
  1509.             b._discardAnimations();
  1510.             if (0 == b._animations.length) {
  1511.               restartWebAnimationsNextTickFlag = false;
  1512.               acs.onanimationiteration = null;
  1513.             } else {
  1514.               acs.onanimationiteration = _onanimationiteration;
  1515.             }
  1516.  
  1517.           }
  1518.  
  1519.  
  1520.  
  1521.           const restartWebAnimationsNextTick = () => {
  1522.             if (!restartWebAnimationsNextTickFlag) {
  1523.               restartWebAnimationsNextTickFlag = true;
  1524.               acs.onanimationiteration = _onanimationiteration;
  1525.  
  1526.             }
  1527.           }
  1528.  
  1529.           return { restartWebAnimationsNextTick }
  1530.         };
  1531.  
  1532.  
  1533.  
  1534.         const { restartWebAnimationsNextTick } = ('onanimationiteration' in document.documentElement) ? looperMethodN() : looperMethodT();
  1535.  
  1536.         timProto._play = function (c) {
  1537.           c = new Animation(c, this);
  1538.           this._animations.push(c);
  1539.           restartWebAnimationsNextTick();
  1540.           c._updatePromises();
  1541.           c._animation.play();
  1542.           c._updatePromises();
  1543.           return c
  1544.         }
  1545.  
  1546.         const animationsWithPromisesMap = new Set(originalAnimationsWithPromises);
  1547.         originalAnimationsWithPromises.length = 0;
  1548.         originalAnimationsWithPromises.push = null;
  1549.         originalAnimationsWithPromises.splice = null;
  1550.         originalAnimationsWithPromises.slice = null;
  1551.         originalAnimationsWithPromises.indexOf = null;
  1552.         originalAnimationsWithPromises.unshift = null;
  1553.         originalAnimationsWithPromises.shift = null;
  1554.         originalAnimationsWithPromises.pop = null;
  1555.         originalAnimationsWithPromises.filter = null;
  1556.         originalAnimationsWithPromises.forEach = null;
  1557.         originalAnimationsWithPromises.map = null;
  1558.  
  1559.  
  1560.  
  1561.         const _updateAnimationsPromises = () => {
  1562.           animationsWithPromisesMap.forEach(c => {
  1563.             if (!c._updatePromises()) animationsWithPromisesMap.delete(c);
  1564.           })
  1565.           /*
  1566.           v.animationsWithPromises = v.animationsWithPromises.filter(function (c) {
  1567.             return c._updatePromises();
  1568.           });
  1569.           */
  1570.         }
  1571.  
  1572.         timProto._updateAnimationsPromises31 = timProto._updateAnimationsPromises;
  1573.  
  1574.         timProto._updateAnimationsPromises = _updateAnimationsPromises;
  1575.  
  1576.  
  1577.         let pdFinished = Object.getOwnPropertyDescriptor(aniProto, 'finished');
  1578.         aniProto.__finished_native_get__ = pdFinished.get;
  1579.         if (typeof pdFinished.get === 'function' && !pdFinished.set && pdFinished.configurable === true && pdFinished.enumerable === true) {
  1580.  
  1581.  
  1582.           Object.defineProperty(aniProto, 'finished', {
  1583.             get() {
  1584.               this._finishedPromise || (!animationsWithPromisesMap.has(this) && animationsWithPromisesMap.add(this),
  1585.                 this._finishedPromise = new Promise((resolve, reject) => {
  1586.                   this._resolveFinishedPromise = function () {
  1587.                     resolve(this)
  1588.                   };
  1589.                   this._rejectFinishedPromise = function () {
  1590.                     reject({
  1591.                       type: DOMException.ABORT_ERR,
  1592.                       name: "AbortError"
  1593.                     })
  1594.                   };
  1595.                 }),
  1596.                 "finished" == this.playState && this._resolveFinishedPromise());
  1597.               return this._finishedPromise
  1598.             },
  1599.             set: undefined,
  1600.             enumerable: true,
  1601.             configurable: true
  1602.           });
  1603.  
  1604.         }
  1605.  
  1606.  
  1607.  
  1608.         let pdReady = Object.getOwnPropertyDescriptor(aniProto, 'ready');
  1609.         aniProto.__ready_native_get__ = pdReady.get;
  1610.         if (typeof pdReady.get === 'function' && !pdReady.set && pdReady.configurable === true && pdReady.enumerable === true) {
  1611.  
  1612.           Object.defineProperty(aniProto, 'ready', {
  1613.             get() {
  1614.               this._readyPromise || (!animationsWithPromisesMap.has(this) && animationsWithPromisesMap.add(this),
  1615.                 this._readyPromise = new Promise((resolve, reject) => {
  1616.                   this._resolveReadyPromise = function () {
  1617.                     resolve(this)
  1618.                   };
  1619.                   this._rejectReadyPromise = function () {
  1620.                     reject({
  1621.                       type: DOMException.ABORT_ERR,
  1622.                       name: "AbortError"
  1623.                     })
  1624.                   };
  1625.                 }),
  1626.                 "pending" !== this.playState && this._resolveReadyPromise());
  1627.               return this._readyPromise
  1628.             },
  1629.             set: undefined,
  1630.             enumerable: true,
  1631.             configurable: true
  1632.           });
  1633.  
  1634.         }
  1635.  
  1636.  
  1637.  
  1638.  
  1639.         /*
  1640.  
  1641.  
  1642.           function f(c) {
  1643.               var b = v.timeline;
  1644.               b.currentTime = c;
  1645.               b._discardAnimations();
  1646.               0 == b._animations.length ? d = !1 : requestAnimationFrame(f)
  1647.           }
  1648.           var h = window.requestAnimationFrame;
  1649.           window.requestAnimationFrame = function(c) {
  1650.               return h(function(b) {
  1651.                   v.timeline._updateAnimationsPromises();
  1652.                   c(b);
  1653.                   v.timeline._updateAnimationsPromises()
  1654.               })
  1655.           }
  1656.           ;
  1657.           v.AnimationTimeline = function() {
  1658.               this._animations = [];
  1659.               this.currentTime = void 0
  1660.           }
  1661.           ;
  1662.           v.AnimationTimeline.prototype = {
  1663.               getAnimations: function() {
  1664.                   this._discardAnimations();
  1665.                   return this._animations.slice()
  1666.               },
  1667.               _updateAnimationsPromises: function() {
  1668.                   v.animationsWithPromises = v.animationsWithPromises.filter(function(c) {
  1669.                       return c._updatePromises()
  1670.                   })
  1671.               },
  1672.               _discardAnimations: function() {
  1673.                   this._updateAnimationsPromises();
  1674.                   this._animations = this._animations.filter(function(c) {
  1675.                       return "finished" != c.playState && "idle" != c.playState
  1676.                   })
  1677.               },
  1678.               _play: function(c) {
  1679.                   c = new v.Animation(c,this);
  1680.                   this._animations.push(c);
  1681.                   v.restartWebAnimationsNextTick();
  1682.                   c._updatePromises();
  1683.                   c._animation.play();
  1684.                   c._updatePromises();
  1685.                   return c
  1686.               },
  1687.               play: function(c) {
  1688.                   c && c.remove();
  1689.                   return this._play(c)
  1690.               }
  1691.           };
  1692.           var d = !1;
  1693.           v.restartWebAnimationsNextTick = function() {
  1694.               d || (d = !0,
  1695.               requestAnimationFrame(f))
  1696.           }
  1697.           ;
  1698.           var a = new v.AnimationTimeline;
  1699.           v.timeline = a;
  1700.           try {
  1701.               Object.defineProperty(window.document, "timeline", {
  1702.                   configurable: !0,
  1703.                   get: function() {
  1704.                       return a
  1705.                   }
  1706.               })
  1707.           } catch (c) {}
  1708.           try {
  1709.               window.document.timeline = a
  1710.           } catch (c) {}
  1711.  
  1712.         */
  1713.  
  1714.  
  1715.  
  1716.         /*
  1717.  
  1718.       var g = window.getComputedStyle;
  1719.       Object.defineProperty(window, "getComputedStyle", {
  1720.           configurable: !0,
  1721.           enumerable: !0,
  1722.           value: function() {
  1723.               v.timeline._updateAnimationsPromises();
  1724.               var e = g.apply(this, arguments);
  1725.               h() && (e = g.apply(this, arguments));
  1726.               v.timeline._updateAnimationsPromises();
  1727.               return e
  1728.           }
  1729.       });
  1730.  
  1731.       */
  1732.  
  1733.  
  1734.  
  1735.  
  1736.       }
  1737.  
  1738.  
  1739.  
  1740.  
  1741.     })();
  1742.  
  1743.  
  1744.  
  1745.   });
  1746.  
  1747.  
  1748.   setupEvents();
  1749.  
  1750.  
  1751.  
  1752.   if (isMainWindow) {
  1753.  
  1754.     console.groupCollapsed(
  1755.       "%cYouTube JS Engine Tamer",
  1756.       "background-color: #EDE43B ; color: #000 ; font-weight: bold ; padding: 4px ;"
  1757.     );
  1758.  
  1759.     console.log("Script is loaded.");
  1760.     console.log("This script changes the core mechanisms of the YouTube JS engine.");
  1761.  
  1762.     console.log("This script is experimental and subject to further changes.");
  1763.  
  1764.     console.log("This might boost your YouTube performance.");
  1765.  
  1766.     console.log("CAUTION: This might break your YouTube.");
  1767.  
  1768.     console.groupEnd();
  1769.  
  1770.   }
  1771.  
  1772.  
  1773. })();