☰

SE Preview on hover

Shows preview of the linked questions/answers on hover

  1. // ==UserScript==
  2. // @name           SE Preview on hover
  3. // @description    Shows preview of the linked questions/answers on hover
  4. // @version        1.1.7
  5. // @author         wOxxOm
  6. // @namespace      wOxxOm.scripts
  7. // @license        MIT License
  8. //
  9. // please use only matches for the previewable targets and make sure the domain
  10. // is extractable via [-.\w] so that it starts with . like .stackoverflow.com
  11. // @match          *://*.stackoverflow.com/*
  12. // @match          *://*.superuser.com/*
  13. // @match          *://*.serverfault.com/*
  14. // @match          *://*.askubuntu.com/*
  15. // @match          *://*.stackapps.com/*
  16. // @match          *://*.mathoverflow.net/*
  17. // @match          *://*.stackexchange.com/*
  18. // stackexchange.com must be the last main site
  19. //
  20. // @include        /https?:\/\/(www\.)?google(\.com?)?(\.\w\w)?\/(webhp|q|.*?[?#]q=|search).*/
  21. // @match          *://www.google.com/search*
  22. // @match          *://*.bing.com/*
  23. // @match          *://*.yahoo.com/*
  24. // @include        /https?:\/\/(\w+\.)*yahoo.(com|\w\w(\.\w\w)?)\/.*/
  25. //
  26. // @require        https://cdn.jsdelivr.net/gh/openstyles/lz-string-unsafe@22af192175b5e1707f49c57de7ce942d4d4ad480/lz-string-unsafe.min.js
  27. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/highlight.min.js
  28. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/languages/autohotkey.min.js
  29. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/languages/autoit.min.js
  30. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/languages/dart.min.js
  31. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/languages/delphi.min.js
  32. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/languages/haskell.min.js
  33. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/languages/moonscript.min.js
  34. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/languages/nsis.min.js
  35. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/languages/powershell.min.js
  36. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/languages/r.min.js
  37. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/languages/vbnet.min.js
  38. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/languages/vbscript-html.min.js
  39. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/languages/vbscript.min.js
  40. // @require        https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/languages/x86asm.min.js
  41. // @resource       HL-style https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/styles/default.min.css
  42. // @resource       HL-style-dark https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.2.0/styles/atom-one-dark-reasonable.min.css
  43. //
  44. // @grant          GM_addStyle
  45. // @grant          GM_xmlhttpRequest
  46. // @grant          GM_getValue
  47. // @grant          GM_setValue
  48. // @grant          GM_getResourceText
  49. //
  50. // @connect        stackoverflow.com
  51. // @connect        superuser.com
  52. // @connect        serverfault.com
  53. // @connect        askubuntu.com
  54. // @connect        stackapps.com
  55. // @connect        mathoverflow.net
  56. // @connect        stackexchange.com
  57. // @connect        sstatic.net
  58. // @connect        gravatar.com
  59. // @connect        imgur.com
  60. // @connect        self
  61. //
  62. // @noframes
  63. // @run-at         document-idle
  64. // ==/UserScript==
  65.  
  66. /* global hljs LZStringUnsafe */
  67. 'use strict';
  68.  
  69. Promise.resolve().then(() => {
  70.   Detector.init();
  71.   Security.init();
  72.   Urler.init();
  73.   Cache.init();
  74. });
  75.  
  76. const PREVIEW_DELAY = 200;
  77. const AUTOHIDE_DELAY = 1000;
  78. const BUSY_CURSOR_DELAY = 300;
  79. // 1 minute for the recently active posts, scales up logarithmically
  80. const CACHE_DURATION = 60e3;
  81.  
  82. const PADDING = 24;
  83. const PROSE_WIDTH = 660; // .s-prose selector
  84. const PROSE_MARGIN = 16; // .s-prose margin-right
  85. const WIDTH = PROSE_WIDTH + PADDING * 2;
  86. const BORDER = 8;
  87. const TOP_BORDER = 24;
  88. const MIN_HEIGHT = 200;
  89. let colors;
  90. const COLORS_LIGHT = {
  91.   body: {
  92.     back: '#ffffff',
  93.     fore: '#000000',
  94.   },
  95.   question: {
  96.     back: '#5894d8',
  97.     fore: '#265184',
  98.     foreInv: '#fff',
  99.   },
  100.   answer: {
  101.     back: '#70c350',
  102.     fore: '#3f7722',
  103.     foreInv: '#fff',
  104.   },
  105.   deleted: {
  106.     back: '#cd9898',
  107.     fore: '#b56767',
  108.     foreInv: '#fff',
  109.   },
  110.   closed: {
  111.     back: '#ffce5d',
  112.     fore: '#c28800',
  113.     foreInv: '#fff',
  114.   },
  115. };
  116. const COLORS_DARK = {
  117.   body: {
  118.     back: '#222222',
  119.     fore: '#cccccc',
  120.   },
  121.   question: {
  122.     back: '#004696',
  123.     fore: '#6abaff',
  124.     foreInv: '#004696',
  125.   },
  126.   answer: {
  127.     back: '#004c1b',
  128.     fore: '#39c466',
  129.     foreInv: '#004c1b',
  130.   },
  131.   deleted: {
  132.     back: '#4d0a0b',
  133.     fore: '#b56767',
  134.     foreInv: '#fff',
  135.   },
  136.   closed: {
  137.     back: '#4b360a',
  138.     fore: '#c28800',
  139.     foreInv: '#fff',
  140.   },
  141. };
  142. const ID = 'SEpreview';
  143. const EXPANDO = Symbol(ID);
  144.  
  145. const pv = {
  146.   /** @type {Target} */
  147.   target: null,
  148.   /** @type {Element} */
  149.   _frame: null,
  150.   /** @type {Element} */
  151.   get frame() {
  152.     if (!this._frame)
  153.       Preview.init();
  154.     if (!document.contains(this._frame))
  155.       document.body.appendChild(this._frame);
  156.     return this._frame;
  157.   },
  158.   set frame(element) {
  159.     this._frame = element;
  160.     return element;
  161.   },
  162.   /** @type {Post} */
  163.   post: {},
  164.   hover: {x: 0, y: 0},
  165.   stylesOverride: '',
  166. };
  167.  
  168. class Detector {
  169.  
  170.   static init() {
  171.     const {matches} = GM_info.script;
  172.     const sites = matches
  173.       .slice(0, matches.findIndex(m => m.includes('stackexchange.com')) + 1)
  174.       .map(m => m.match(/[-.\w]+/)[0]);
  175.     const rxsSites = 'https?://(\\w*\\.)*(' +
  176.       matches
  177.         .map(m => m.match(/^.*?\/\/\W*(\w.*?)\//)[1].replace(/\./g, '\\.'))
  178.         .join('|') +
  179.       ')/';
  180.     Detector.rxPreviewableSite = new RegExp(rxsSites);
  181.     Detector.rxPreviewablePost = new RegExp(rxsSites + '(questions|q|a|posts/comments)/\\d+');
  182.     Detector.pageUrls = getBaseUrls(location, Detector.rxPreviewablePost);
  183.     Detector.isStackExchangePage = Detector.rxPreviewableSite.test(location);
  184.  
  185.     const {
  186.       rxPreviewablePost,
  187.       isStackExchangePage: isSE,
  188.       pageUrls: {base, baseShort},
  189.     } = Detector;
  190.  
  191.     // array of target elements accumulated in mutation observer
  192.     // cleared in attachHoverListener
  193.     const moQueue = [];
  194.  
  195.     onMutation([{
  196.       addedNodes: [document.body],
  197.     }]);
  198.  
  199.     new MutationObserver(onMutation)
  200.       .observe(document.body, {
  201.         childList: true,
  202.         subtree: true,
  203.       });
  204.  
  205.     Detector.init = true;
  206.  
  207.     function onMutation(mutations) {
  208.       const alreadyScheduled = moQueue.length > 0;
  209.       for (const {addedNodes} of mutations) {
  210.         for (const n of addedNodes) {
  211.           if (!n.localName)
  212.             continue;
  213.           if (n.localName === 'a') {
  214.             moQueue.push(n);
  215.             continue;
  216.           }
  217.           // not using ..spreading since there could be 100k links for all we know
  218.           // and that might exceed JS engine stack limit which can be pretty low
  219.           const targets = n.getElementsByTagName('a');
  220.           for (let k = 0, len = targets.length; k < len; k++)
  221.             moQueue.push(targets[k]);
  222.           if (!isSE)
  223.             continue;
  224.           if (n.classList.contains('question-summary')) {
  225.             moQueue.push(...n.getElementsByClassName('answered'));
  226.             moQueue.push(...n.getElementsByClassName('answered-accepted'));
  227.             continue;
  228.           }
  229.           for (const el of n.getElementsByClassName('question-summary')) {
  230.             moQueue.push(...el.getElementsByClassName('answered'));
  231.             moQueue.push(...el.getElementsByClassName('answered-accepted'));
  232.           }
  233.         }
  234.       }
  235.       if (!alreadyScheduled && moQueue.length)
  236.         setTimeout(hoverize);
  237.     }
  238.  
  239.     function hoverize() {
  240.       for (const el of moQueue) {
  241.         if (el[EXPANDO] instanceof Target)
  242.           continue;
  243.         if (el.localName === 'a') {
  244.           if (isSE && el.classList.contains('js-share-link'))
  245.             continue;
  246.           const previewable = isPreviewable(el) || !isSE && isEmbeddedUrlPreviewable(el);
  247.           if (!previewable)
  248.             continue;
  249.           const url = Urler.makeHttps(el.href);
  250.           if (url.startsWith(base) || url.startsWith(baseShort))
  251.             continue;
  252.         }
  253.         Target.createHoverable(el);
  254.       }
  255.       moQueue.length = 0;
  256.     }
  257.  
  258.     function isPreviewable(a) {
  259.       let href = false;
  260.       const host = '.' + a.hostname;
  261.       const hostLen = host.length;
  262.       for (const stackSite of sites) {
  263.         if (host[hostLen - stackSite.length] === '.' &&
  264.             host.endsWith(stackSite) &&
  265.             rxPreviewablePost.test(href || (href = a.href)))
  266.           return true;
  267.       }
  268.     }
  269.  
  270.     function isEmbeddedUrlPreviewable(a) {
  271.       const url = a.href;
  272.       let i = url.indexOf('http', 1);
  273.       if (i < 0)
  274.         return false;
  275.       i = (
  276.         url.indexOf('http://', i) + 1 ||
  277.         url.indexOf('https://', i) + 1 ||
  278.         url.indexOf('http%3A%2F%2F', i) + 1 ||
  279.         url.indexOf('https%3A%2F%2F', i) + 1
  280.       ) - 1;
  281.       if (i < 0)
  282.         return false;
  283.       const j = url.indexOf('&', i);
  284.       const embeddedUrl = url.slice(i, j > 0 ? j : undefined);
  285.       return rxPreviewablePost.test(embeddedUrl);
  286.     }
  287.  
  288.     function getBaseUrls(url, rx) {
  289.       if (!rx.test(url))
  290.         return {};
  291.       const base = Urler.makeHttps(RegExp.lastMatch);
  292.       return {
  293.         base,
  294.         baseShort: base.replace('/questions/', '/q/'),
  295.       };
  296.     }
  297.   }
  298. }
  299.  
  300. /**
  301.  * @property {Element} element
  302.  * @property {Boolean} isLink
  303.  * @property {String}  url
  304.  * @property {Number}  timer
  305.  * @property {Number}  timerCursor
  306.  * @property {String}  savedCursor
  307.  */
  308. class Target {
  309.  
  310.   /** @param {Element} el */
  311.   static createHoverable(el) {
  312.     const target = new Target(el);
  313.     Object.defineProperty(el, EXPANDO, {value: target});
  314.     el.removeAttribute('title');
  315.     el.addEventListener('mouseover', Target._onMouseOver);
  316.     return target;
  317.   }
  318.  
  319.   /** @param {Element} el */
  320.   constructor(el) {
  321.     this.element = el;
  322.     this.isLink = el.localName === 'a';
  323.   }
  324.  
  325.   release() {
  326.     $.off('mousemove', this.element, Target._onMove);
  327.     $.off('mouseout', this.element, Target._onHoverEnd);
  328.     $.off('mousedown', this.element, Target._onHoverEnd);
  329.  
  330.     for (const k in this) {
  331.       if (k.startsWith('timer') && this[k] >= 1) {
  332.         clearTimeout(this[k]);
  333.         this[k] = 0;
  334.       }
  335.     }
  336.     BusyCursor.hide(this);
  337.     pv.target = null;
  338.   }
  339.  
  340.   get url() {
  341.     const el = this.element;
  342.     if (this.isLink)
  343.       return el.href;
  344.     const a = $('a', el.closest('.question-summary'));
  345.     if (a)
  346.       return a.href;
  347.   }
  348.  
  349.   /** @param {MouseEvent} e */
  350.   static _onMouseOver(e) {
  351.     if (Util.hasKeyModifiers(e))
  352.       return;
  353.     const self = /** @type {Target} */ this[EXPANDO];
  354.     if (self === Preview.target && Preview.shown() ||
  355.         self === pv.target)
  356.       return;
  357.  
  358.     if (pv.target)
  359.       pv.target.release();
  360.     pv.target = self;
  361.  
  362.     pv.hover.x = e.pageX;
  363.     pv.hover.y = e.pageY;
  364.  
  365.     $.on('mousemove', this, Target._onMove);
  366.     $.on('mouseout', this, Target._onHoverEnd);
  367.     $.on('mousedown', this, Target._onHoverEnd);
  368.  
  369.     Target._restartTimer(self);
  370.   }
  371.  
  372.   /** @param {MouseEvent} e */
  373.   static _onHoverEnd(e) {
  374.     if (e.type === 'mouseout' && e.target !== this)
  375.       return;
  376.     const self = /** @type {Target} */ this[EXPANDO];
  377.     if (pv.xhr && pv.target === self) {
  378.       pv.xhr.abort();
  379.       pv.xhr = null;
  380.     }
  381.     self.release();
  382.     self.timer = setTimeout(Target._onAbortTimer, AUTOHIDE_DELAY, self);
  383.   }
  384.  
  385.   /** @param {MouseEvent} e */
  386.   static _onMove(e) {
  387.     const stoppedMoving =
  388.       Math.abs(pv.hover.x - e.pageX) < 2 &&
  389.       Math.abs(pv.hover.y - e.pageY) < 2;
  390.     if (stoppedMoving) {
  391.       pv.hover.x = e.pageX;
  392.       pv.hover.y = e.pageY;
  393.       Target._restartTimer(this[EXPANDO]);
  394.     }
  395.   }
  396.  
  397.   /** @param {Target} self */
  398.   static _restartTimer(self) {
  399.     if (self.timer)
  400.       clearTimeout(self.timer);
  401.     self.timer = setTimeout(Target._onTimer, PREVIEW_DELAY, self);
  402.   }
  403.  
  404.   /** @param {Target} self */
  405.   static _onTimer(self) {
  406.     self.timer = 0;
  407.     const el = self.element;
  408.     if (!el.matches(':hover')) {
  409.       self.release();
  410.       return;
  411.     }
  412.     $.off('mousemove', el, Target._onMove);
  413.  
  414.     if (self.url)
  415.       Preview.start(self);
  416.   }
  417.  
  418.   /** @param {Target} self */
  419.   static _onAbortTimer(self) {
  420.     if ((self === pv.target || self === Preview.target) &&
  421.         pv.frame && !pv.frame.matches(':hover')) {
  422.       pv.target = null;
  423.       Preview.hide({fade: true});
  424.     }
  425.   }
  426. }
  427.  
  428.  
  429. class BusyCursor {
  430.  
  431.   /** @param {Target} target */
  432.   static schedule(target) {
  433.     target.timerCursor = setTimeout(BusyCursor._onTimer, BUSY_CURSOR_DELAY, target);
  434.   }
  435.  
  436.   /** @param {Target} target */
  437.   static hide(target) {
  438.     if (target.timerCursor) {
  439.       clearTimeout(target.timerCursor);
  440.       target.timerCursor = 0;
  441.     }
  442.     const style = target.element.style;
  443.     if (style.cursor === 'wait')
  444.       style.cursor = target.savedCursor;
  445.   }
  446.  
  447.   /** @param {Target} target */
  448.   static _onTimer(target) {
  449.     target.timerCursor = 0;
  450.     target.savedCursor = target.element.style.cursor;
  451.     $.setStyle(target.element, ['cursor', 'wait']);
  452.   }
  453. }
  454.  
  455.  
  456. class Preview {
  457.  
  458.   static init() {
  459.     pv.frame = $.create(`#${ID}`, {parent: document.body});
  460.     pv.shadow = pv.frame.attachShadow({mode: 'open'});
  461.     pv.body = $.create(`body#${ID}-body`, {parent: pv.shadow});
  462.  
  463.     const WRAP_AROUND = '(or wrap around to the question)';
  464.     const TITLE_PREV = 'Previous answer\n' + WRAP_AROUND;
  465.     const TITLE_NEXT = 'Next answer\n' + WRAP_AROUND;
  466.     const TITLE_ENTER = 'Return to the question\n(Enter was Return initially)';
  467.  
  468.     pv.answersTitle =
  469.       $.create(`#${ID}-answers-title`, [
  470.         'Answers:',
  471.         $.create('p', [
  472.           'Use ',
  473.           $.create('b', {title: TITLE_PREV}),
  474.           $.create('b', {title: TITLE_NEXT, attributes: {mirrored: ''}}),
  475.           $.create('label', {title: TITLE_ENTER}, 'Enter'),
  476.           ' to switch entries',
  477.         ]),
  478.       ]);
  479.  
  480.     $.on('keydown', pv.frame, Preview.onKey);
  481.     $.on('keyup', pv.frame, Util.consumeEsc);
  482.  
  483.     $.on('mouseover', pv.body, ScrollLock.enable);
  484.     $.on('click', pv.body, Preview.onClick);
  485.  
  486.     Sizer.init();
  487.     Styles.init();
  488.     Preview.init = true;
  489.   }
  490.  
  491.   /** @param {Target} target */
  492.   static async start(target) {
  493.     Preview.target = target;
  494.  
  495.     if (!Security.checked)
  496.       Security.check();
  497.  
  498.     const {url} = target;
  499.  
  500.     let data = Cache.read(url);
  501.     if (data) {
  502.       const r = await Urler.get(url, {method: 'HEAD'});
  503.       const postTime = Util.getResponseDate(r.responseHeaders);
  504.       if (postTime >= data.time)
  505.         data = null;
  506.     }
  507.  
  508.     if (!data) {
  509.       BusyCursor.schedule(target);
  510.       const {finalUrl, responseText: html} = await Urler.get(target.url);
  511.       data = {finalUrl, html, unsaved: true};
  512.       BusyCursor.hide(target);
  513.     }
  514.  
  515.     data.url = url;
  516.     data.showAnswer = !target.isLink;
  517.  
  518.     if (!Preview.prepare(data))
  519.       Preview.target = null;
  520.     else if (data.unsaved && data.lastActivity >= 1)
  521.       Preview.save(data);
  522.   }
  523.  
  524.   static save({url, finalUrl, html, lastActivity}) {
  525.     const inactiveDays = Math.max(0, (Date.now() - lastActivity) / (24 * 3600e3));
  526.     const cacheDuration = CACHE_DURATION * Math.pow(Math.log(inactiveDays + 1) + 1, 2);
  527.     setTimeout(Cache.write, 1000, {url, finalUrl, html, cacheDuration});
  528.   }
  529.  
  530.   // data is mutated: its lastActivity property is assigned!
  531.   static prepare(data) {
  532.     const {finalUrl, html, showAnswer, doc = Util.parseHtml(html)} = data;
  533.  
  534.     if (!doc || !doc.head)
  535.       return Util.error('no HEAD in the document received for', finalUrl);
  536.  
  537.     let answerId;
  538.     if (showAnswer) {
  539.       const el = $('[id^="answer-"]', doc);
  540.       answerId = el && el.id.match(/\d+/)[0];
  541.     } else {
  542.       answerId = finalUrl.match(/questions\/\d+\/[^/]+\/(\d+)|$/)[1];
  543.     }
  544.     const selector = answerId ? '#answer-' + answerId : '#question';
  545.     const core = $(`${selector} .${answerId ? 'answer' : 'post'}cell`, doc);
  546.     if (!core)
  547.       return Util.error('No parsable post found', doc);
  548.  
  549.     const isQuestion = !answerId;
  550.     const status = isQuestion && $('[role="status"]', core);
  551.     const isClosed = status && $('[href*="closed"]', status);
  552.     const isDeleted = Boolean(core.closest('.deleted-answer'));
  553.     const type = [
  554.       isQuestion && 'question' || 'answer',
  555.       isDeleted && 'deleted',
  556.       isClosed && 'closed',
  557.     ].filter(Boolean).join(' ');
  558.     const answers = $.all('.answer', doc);
  559.     const comments = $(`${selector} .comments`, doc);
  560.     const commentsParent = comments.parentElement;
  561.     const showMoreComments = $(`${selector} .js-show-link.comments-link`, doc);
  562.     const lastActivity = Util.tryCatch(Util.extractTime, $('a[href*="?lastactivity"]', core)) ||
  563.                          Date.now();
  564.     Object.assign(pv, {
  565.       finalUrl,
  566.       finalUrlOfQuestion: Urler.makeCacheable(finalUrl),
  567.     });
  568.     /** @typedef Post
  569.      * @property {Document}  doc
  570.      * @property {String}    html
  571.      * @property {String}    selector
  572.      * @property {String}    type
  573.      * @property {String}    id
  574.      * @property {String}    title
  575.      * @property {Boolean}   isQuestion
  576.      * @property {Boolean}   isDeleted
  577.      * @property {Number}    lastActivity
  578.      * @property {Number}    numAnswers
  579.      * @property {Element}   core
  580.      * @property {Element}   comments
  581.      * @property {Element[]} answers
  582.      * @property {Element[]} renderParts
  583.      */
  584.     Object.assign(pv.post, {
  585.       doc,
  586.       html,
  587.       core,
  588.       selector,
  589.       answers,
  590.       comments,
  591.       type,
  592.       isQuestion,
  593.       isDeleted,
  594.       lastActivity,
  595.       id: isQuestion ? Urler.getFirstNumber(finalUrl) : answerId,
  596.       title: $('meta[property="og:title"]', doc).content,
  597.       numAnswers: answers.length,
  598.       renderParts: [
  599.         // including the parent so the right CSS kicks in
  600.         core,
  601.         commentsParent,
  602.       ],
  603.     });
  604.  
  605.     $.remove('script', doc);
  606.     // remove the comment actions block
  607.     $.remove('.comment-form, [id^="comments-link-"], .hover-only-label', commentsParent);
  608.     if (!commentsParent.contains(showMoreComments))
  609.       commentsParent.appendChild(showMoreComments);
  610.     // Expanding relative URLs manually since <base> may be restricted via CSP
  611.     for (const a of $.all('a[href]:not([href*=":"])', doc))
  612.       a.href = new URL(a.getAttribute('href'), finalUrl);
  613.  
  614.     Promise.all([
  615.       pv.frame,
  616.       Preview.addStyles(),
  617.       Security.ready(),
  618.     ]).then(Preview.show);
  619.  
  620.     data.lastActivity = lastActivity;
  621.     return true;
  622.   }
  623.  
  624.   static show() {
  625.     Render.all();
  626.  
  627.     const style = getComputedStyle(pv.frame);
  628.     if (style.opacity !== '1' || style.display !== 'block') {
  629.       $.setStyle(pv.frame, ['display', 'block']);
  630.       setTimeout($.setStyle, 0, pv.frame, ['opacity', '1']);
  631.     }
  632.  
  633.     pv.parts.focus();
  634.   }
  635.  
  636.   static hide({fade = false} = {}) {
  637.     if (Preview.target) {
  638.       Preview.target.release();
  639.       Preview.target = null;
  640.     }
  641.  
  642.     pv.body.onmouseover = null;
  643.     pv.body.onclick = null;
  644.     pv.body.onkeydown = null;
  645.  
  646.     if (fade) {
  647.       Util.fadeOut(pv.frame)
  648.         .then(Preview.eraseBoxIfHidden);
  649.     } else {
  650.       $.setStyle(pv.frame,
  651.         ['opacity', '0'],
  652.         ['display', 'none']);
  653.       Preview.eraseBoxIfHidden();
  654.     }
  655.   }
  656.  
  657.   static shown() {
  658.     return pv.frame.style.opacity === '1';
  659.   }
  660.  
  661.   /** @param {KeyboardEvent} e */
  662.   static onKey(e) {
  663.     switch (e.key) {
  664.       case 'Escape':
  665.         Preview.hide({fade: true});
  666.         break;
  667.       case 'ArrowUp':
  668.       case 'PageUp':
  669.         if (pv.parts.scrollTop)
  670.           return;
  671.         break;
  672.       case 'ArrowDown':
  673.       case 'PageDown': {
  674.         const {scrollTop: t, clientHeight: h, scrollHeight} = pv.parts;
  675.         if (t + h < scrollHeight)
  676.           return;
  677.         break;
  678.       }
  679.       case 'ArrowLeft':
  680.       case 'ArrowRight': {
  681.         if (!pv.post.numAnswers)
  682.           return;
  683.         // current is 0 if isQuestion, 1 is the first answer
  684.         const answers = $.all(`#${ID}-answers a`);
  685.         const current = pv.post.numAnswers ?
  686.           answers.indexOf($('.SEpreviewed')) + 1 :
  687.           pv.post.isQuestion ? 0 : 1;
  688.         const num = pv.post.numAnswers + 1;
  689.         const dir = e.key === 'ArrowLeft' ? -1 : 1;
  690.         const toShow = (current + dir + num) % num;
  691.         const a = toShow ? answers[toShow - 1] : $(`#${ID}-title`);
  692.         a.click();
  693.         break;
  694.       }
  695.       case 'Enter':
  696.         if (pv.post.isQuestion)
  697.           return;
  698.         $(`#${ID}-title`).click();
  699.         break;
  700.       default:
  701.         return;
  702.     }
  703.     e.preventDefault();
  704.   }
  705.  
  706.   /** @param {MouseEvent} e */
  707.   static onClick(e) {
  708.     if (e.target.id === `${ID}-close`) {
  709.       Preview.hide();
  710.       return;
  711.     }
  712.  
  713.     const link = e.target.closest('a');
  714.     if (!link)
  715.       return;
  716.  
  717.     if (link.matches('.js-show-link.comments-link')) {
  718.       Util.fadeOut(link, 0.5);
  719.       Preview.loadComments();
  720.       e.preventDefault();
  721.       return;
  722.     }
  723.  
  724.     if (e.button ||
  725.         Util.hasKeyModifiers(e) ||
  726.         !link.matches('.SEpreviewable')) {
  727.       link.target = '_blank';
  728.       return;
  729.     }
  730.  
  731.     e.preventDefault();
  732.  
  733.     const {doc} = pv.post;
  734.     if (link.id === `${ID}-title`)
  735.       Preview.prepare({doc, finalUrl: pv.finalUrlOfQuestion});
  736.     else if (link.matches(`#${ID}-answers a`))
  737.       Preview.prepare({doc, finalUrl: pv.finalUrlOfQuestion + '/' + Urler.getFirstNumber(link)});
  738.     else
  739.       Preview.start(new Target(link));
  740.   }
  741.  
  742.   static eraseBoxIfHidden() {
  743.     if (!Preview.shown())
  744.       pv.body.textContent = '';
  745.   }
  746.  
  747.   static setHeight(height) {
  748.     const currentHeight = pv.frame.clientHeight;
  749.     const borderHeight = pv.frame.offsetHeight - currentHeight;
  750.     const newHeight = Math.max(MIN_HEIGHT, Math.min(innerHeight - borderHeight, height));
  751.     if (newHeight !== currentHeight)
  752.       $.setStyle(pv.frame, ['height', newHeight + 'px']);
  753.   }
  754.  
  755.   static async addStyles() {
  756.     const isDark = matchMedia('(prefers-color-scheme: dark)').matches;
  757.     colors = isDark ? COLORS_DARK : COLORS_LIGHT;
  758.     pv.body.className = isDark ? 'theme-dark' : '';
  759.     Styles.init(isDark);
  760.  
  761.     let last = $.create(`style#${ID}-styles.${Styles.REUSABLE}`, {
  762.       textContent: pv.stylesOverride,
  763.       before: pv.shadow.firstChild,
  764.     });
  765.  
  766.     if (!pv.styles) {
  767.       pv.styles = new Map();
  768.       pv.stylesScaled = new Set();
  769.     }
  770.  
  771.     const toDownload = [];
  772.     const sourceElements = $.all('link[rel="stylesheet"], style', pv.post.doc);
  773.  
  774.     for (const {href, textContent, localName} of sourceElements) {
  775.       const isLink = localName === 'link';
  776.       const id = ID + '-style-' + (isLink ? href : await Util.sha256(textContent));
  777.       const el = pv.styles.get(id);
  778.       if (!el && isLink)
  779.         toDownload.push(Urler.get({url: href, context: id}));
  780.       last = $.create('style', {
  781.         id,
  782.         className: Styles.REUSABLE,
  783.         textContent: isLink ? $.text(el) : textContent,
  784.         after: last,
  785.       });
  786.       pv.styles.set(id, last);
  787.     }
  788.  
  789.     const downloaded = await Promise.all(toDownload);
  790.  
  791.     for (const {responseText, context: id} of downloaded)
  792.       Styles.applyRemScale(id, responseText);
  793.  
  794.     if (!pv.remScale) {
  795.       pv.remScale = parseFloat(getComputedStyle(pv.body).fontSize) /
  796.                     parseFloat(getComputedStyle(document.documentElement).fontSize);
  797.       if (pv.remScale !== 1)
  798.         for (const id of pv.styles.keys())
  799.           Styles.applyRemScale(id);
  800.     }
  801.   }
  802.  
  803.   static async loadComments() {
  804.     const list = $(`#${pv.post.comments.id} .comments-list`);
  805.     const url = new URL(pv.finalUrl).origin +
  806.                 '/posts/' + pv.post.comments.id.match(/\d+/)[0] + '/comments';
  807.     list.innerHTML = (await Urler.get(url)).responseText;
  808.     $.remove('.hover-only-label', list);
  809.  
  810.     const oldIds = new Set([...list.children].map(e => e.id));
  811.     for (const cmt of list.children) {
  812.       if (!oldIds.has(cmt.id))
  813.         cmt.classList.add('new-comment-highlight');
  814.     }
  815.  
  816.     $.setStyle(list.closest('.comments'), ['display', 'block']);
  817.     Render.previewableLinks(list);
  818.     Render.hoverableUsers(list);
  819.   }
  820. }
  821.  
  822.  
  823. class Render {
  824.  
  825.   static all() {
  826.     pv.frame.classList.toggle(`${ID}-hasAnswerShelf`, pv.post.numAnswers > 0);
  827.     pv.frame.setAttribute(`${ID}-type`, pv.post.type);
  828.     pv.body.setAttribute(`${ID}-type`, pv.post.type);
  829.  
  830.     $.create(`a#${ID}-title.SEpreviewable`, {
  831.       href: pv.finalUrlOfQuestion,
  832.       textContent: pv.post.title,
  833.       parent: pv.body,
  834.     });
  835.  
  836.     $.create(`#${ID}-close`, {
  837.       title: 'Or press Esc key while the preview is focused (also when just shown)',
  838.       parent: pv.body,
  839.     });
  840.  
  841.     $.create(`#${ID}-meta`, {
  842.       parent: pv.body,
  843.       onmousedown: Sizer.onMouseDown,
  844.       children: [
  845.         Render._votes(),
  846.         pv.post.isQuestion
  847.           ? Render._questionMeta()
  848.           : Render._answerMeta(),
  849.       ],
  850.     });
  851.  
  852.     Render.previewableLinks(pv.post.doc);
  853.  
  854.     pv.post.answerShelf = pv.post.answers.map(Render._answer);
  855.     if (Security.noImages)
  856.       Security.embedImages(...pv.post.renderParts);
  857.  
  858.     pv.parts = $.create(`#${ID}-parts`, {
  859.       className: pv.post.isDeleted ? 'deleted-answer' : '',
  860.       tabIndex: 0,
  861.       scrollTop: 0,
  862.       parent: pv.body,
  863.       children: pv.post.renderParts,
  864.     });
  865.  
  866.     Render.hoverableUsers(pv.parts);
  867.  
  868.     if (pv.post.numAnswers) {
  869.       $.create(`#${ID}-answers`, {parent: pv.body}, [
  870.         pv.answersTitle,
  871.         pv.post.answerShelf,
  872.       ]);
  873.     } else {
  874.       $.remove(`#${ID}-answers`, pv.body);
  875.     }
  876.  
  877.     const ACTIONS_SEL = '.js-post-menu > div';
  878.     const elActions = $(ACTIONS_SEL);
  879.  
  880.     // delinkify/remove non-functional items in post-menu
  881.     $.remove('.js-share-link, .flag-post-link', pv.body);
  882.     for (const el of $.all(`${ACTIONS_SEL} button`)) {
  883.       const elWrapper = el.closest(`${ACTIONS_SEL} > div`);
  884.       if (elWrapper) elWrapper.remove();
  885.     }
  886.  
  887.     // add a timeline link
  888.     $.appendChildren(elActions, [
  889.       $.create('div.' + elActions.firstElementChild.className, [
  890.         $.create('a', {href: `/posts/${pv.post.id}/timeline`}, 'Timeline'),
  891.       ]),
  892.     ]);
  893.  
  894.     // prettify code blocks
  895.     hljs.configure({
  896.       languages: [
  897.         ...$.all('.post-taglist .post-tag', pv.post.doc).map($.text),
  898.         'javascript',
  899.         'html',
  900.       ],
  901.     });
  902.     $.all('pre > code').forEach(el => {
  903.       el = el.parentElement;
  904.       el.className = el.className.replace(/((?:^|\s)lang-)bsh(?=\s|$)/, '$1powershell');
  905.       hljs.highlightBlock(el);
  906.     });
  907.  
  908.     const leftovers = $.all('style, link, script');
  909.     for (const el of leftovers) {
  910.       if (el.classList.contains(Styles.REUSABLE))
  911.         el.classList.remove(Styles.REUSABLE);
  912.       else
  913.         el.remove();
  914.     }
  915.  
  916.     pv.post.html = null;
  917.     pv.post.core = null;
  918.     pv.post.renderParts = null;
  919.     pv.post.answers = null;
  920.     pv.post.answerShelf = null;
  921.   }
  922.  
  923.   /** @param {Element} container */
  924.   static previewableLinks(container) {
  925.     for (const a of $.all('a:not(.SEpreviewable)', container)) {
  926.       let href = a.getAttribute('href');
  927.       if (!href)
  928.         continue;
  929.       if (!href.includes('://')) {
  930.         href = a.href;
  931.         a.setAttribute('href', href);
  932.       }
  933.       if (Detector.rxPreviewablePost.test(href)) {
  934.         a.removeAttribute('title');
  935.         a.classList.add('SEpreviewable');
  936.       }
  937.     }
  938.   }
  939.  
  940.   /** @param {Element} container */
  941.   static hoverableUsers(container) {
  942.     for (const a of $.all('a[href*="/users/"]', container)) {
  943.       if (Detector.rxPreviewableSite.test(a.href) &&
  944.           a.pathname.match(/^\/users\/\d+/)) {
  945.         a.onmouseover = UserCard.onUserLinkHovered;
  946.         a.classList.add(`${ID}-userLink`);
  947.       }
  948.     }
  949.   }
  950.  
  951.   /** @param {Element} el */
  952.   static _answer(el) {
  953.     const shortUrl = $('.js-share-link', el).href.replace(/(\d+)\/\d+/, '$1');
  954.     const extraClasses =
  955.       (el.matches(pv.post.selector) ? ' SEpreviewed' : '') +
  956.       (el.matches('.deleted-answer') ? ' deleted-answer' : '') +
  957.       (el.matches('.accepted-answer') ? ` ${ID}-accepted` : '');
  958.     const author = $('.post-signature:last-child', el);
  959.     const title =
  960.       $.text('.user-details a', author) +
  961.       ' (rep ' +
  962.       $.text('.reputation-score', author) +
  963.       ')\n' +
  964.       $.text('.user-action-time', author);
  965.     let gravatar = $('img, .anonymous-gravatar, .community-wiki', author);
  966.     if (gravatar && Security.noImages)
  967.       Security.embedImages(gravatar);
  968.     if (gravatar && gravatar.src)
  969.       gravatar = $.create('img', {src: gravatar.src});
  970.     const a = $.create('a', {
  971.       href: shortUrl,
  972.       title: title,
  973.       className: 'SEpreviewable' + extraClasses,
  974.       textContent: $.text('.js-vote-count', el).replace(/^0$/, '\xA0') + ' ',
  975.       children: gravatar,
  976.     });
  977.     return [a, ' '];
  978.   }
  979.  
  980.   static _votes() {
  981.     const votes = $.text('.js-vote-count', pv.post.core.closest('.post-layout'));
  982.     if (Number(votes))
  983.       return $.create('b', `${votes} vote${Math.abs(votes) >= 2 ? 's' : ''}`);
  984.   }
  985.   static _questionMeta() {
  986.     try {
  987.       return [...$('time', pv.post.doc).closest('.grid').children]
  988.         .map(el => el.textContent.trim())
  989.         .map((s, i) => (i ? s.toLowerCase() : s))
  990.         .join(', ');
  991.     } catch (e) {
  992.       return '';
  993.     }
  994.   }
  995.  
  996.   static _answerMeta() {
  997.     return $.all('.user-action-time', pv.post.core.closest('.answer'))
  998.       .reverse()
  999.       .map($.text)
  1000.       .join(', ');
  1001.   }
  1002. }
  1003.  
  1004.  
  1005. class UserCard {
  1006.  
  1007.   _fadeIn() {
  1008.     this._retakeId(this);
  1009.     $.setStyle(this.element,
  1010.       ['opacity', '0'],
  1011.       ['display', 'block']);
  1012.     this.timer = setTimeout(() => {
  1013.       if (this.timer)
  1014.         $.setStyle(this.element, ['opacity', '1']);
  1015.     });
  1016.   }
  1017.  
  1018.   _retakeId() {
  1019.     if (this.element.id !== 'user-menu') {
  1020.       const oldCard = $('#user-menu');
  1021.       if (oldCard)
  1022.         oldCard.id = oldCard.style.display = '';
  1023.       this.element.id = 'user-menu';
  1024.     }
  1025.   }
  1026.  
  1027.   // 'this' is the hoverable link enclosing the user's name/avatar
  1028.   static onUserLinkHovered() {
  1029.     clearTimeout(this[EXPANDO]);
  1030.     this[EXPANDO] = setTimeout(UserCard._show, PREVIEW_DELAY * 2, this);
  1031.   }
  1032.  
  1033.   /** @param {HTMLAnchorElement} a */
  1034.   static async _show(a) {
  1035.     if (!a.matches(':hover'))
  1036.       return;
  1037.     const el = a.nextElementSibling;
  1038.     const card = el && el.matches(`.${ID}-userCard`) && el[EXPANDO] ||
  1039.                  await UserCard._create(a);
  1040.     card._fadeIn();
  1041.   }
  1042.  
  1043.   /** @param {HTMLAnchorElement} a */
  1044.   static async _create(a) {
  1045.     const url = a.origin + '/users/user-info/' + Urler.getFirstNumber(a);
  1046.     let {html} = Cache.read(url) || {};
  1047.     if (!html) {
  1048.       html = (await Urler.get(url)).responseText;
  1049.       Cache.write({url, html, cacheDuration: CACHE_DURATION * 100});
  1050.     }
  1051.  
  1052.     const dom = Util.parseHtml(html);
  1053.     if (Security.noImages)
  1054.       Security.embedImages(dom);
  1055.  
  1056.     const b = a.getBoundingClientRect();
  1057.     const pb = pv.parts.getBoundingClientRect();
  1058.     const left = Math.min(b.left - 20, pb.right - 350) - pb.left + 'px';
  1059.     const isClipped = b.bottom + 100 > pb.bottom;
  1060.  
  1061.     const el = $.create(`#user-menu-tmp.${ID}-userCard`, {
  1062.       attributes: {
  1063.         style: `left: ${left} !important;` +
  1064.                (isClipped ? 'margin-top: -5rem !important;' : ''),
  1065.       },
  1066.       onmouseout: UserCard._onMouseOut,
  1067.       children: dom.body.children,
  1068.       after: a,
  1069.     });
  1070.  
  1071.     const card = new UserCard(el);
  1072.     Object.defineProperty(el, EXPANDO, {value: card});
  1073.     card.element = el;
  1074.     return card;
  1075.   }
  1076.  
  1077.   /** @param {MouseEvent} e */
  1078.   static _onMouseOut(e) {
  1079.     if (this.matches(':hover') ||
  1080.         this.style.opacity === '0' /* fading out already */)
  1081.       return;
  1082.  
  1083.     const self = /** @type {UserCard} */ this[EXPANDO];
  1084.     clearTimeout(self.timer);
  1085.     self.timer = 0;
  1086.  
  1087.     Util.fadeOut(this);
  1088.   }
  1089. }
  1090.  
  1091.  
  1092. class Sizer {
  1093.  
  1094.   static init() {
  1095.     Preview.setHeight(GM_getValue('height', innerHeight / 3) >> 0);
  1096.   }
  1097.  
  1098.   /** @param {MouseEvent} e */
  1099.   static onMouseDown(e) {
  1100.     if (e.button !== 0 || Util.hasKeyModifiers(e))
  1101.       return;
  1102.     Sizer._heightDelta = innerHeight - e.clientY - pv.frame.clientHeight;
  1103.     $.on('mousemove', document, Sizer._onMouseMove);
  1104.     $.on('mouseup', document, Sizer._onMouseUp);
  1105.   }
  1106.  
  1107.   /** @param {MouseEvent} e */
  1108.   static _onMouseMove(e) {
  1109.     Preview.setHeight(innerHeight - e.clientY - Sizer._heightDelta);
  1110.     getSelection().removeAllRanges();
  1111.   }
  1112.  
  1113.   /** @param {MouseEvent} e */
  1114.   static _onMouseUp(e) {
  1115.     GM_setValue('height', pv.frame.clientHeight);
  1116.     $.off('mouseup', document, Sizer._onMouseUp);
  1117.     $.off('mousemove', document, Sizer._onMouseMove);
  1118.   }
  1119. }
  1120.  
  1121.  
  1122. class ScrollLock {
  1123.  
  1124.   static enable() {
  1125.     if (ScrollLock.active)
  1126.       return;
  1127.     ScrollLock.active = true;
  1128.     ScrollLock.x = scrollX;
  1129.     ScrollLock.y = scrollY;
  1130.     $.on('mouseover', document.body, ScrollLock._onMouseOver);
  1131.     $.on('scroll', document, ScrollLock._onScroll);
  1132.   }
  1133.  
  1134.   static disable() {
  1135.     ScrollLock.active = false;
  1136.     $.off('mouseover', document.body, ScrollLock._onMouseOver);
  1137.     $.off('scroll', document, ScrollLock._onScroll);
  1138.   }
  1139.  
  1140.   static _onMouseOver() {
  1141.     if (ScrollLock.active)
  1142.       ScrollLock.disable();
  1143.   }
  1144.  
  1145.   static _onScroll() {
  1146.     scrollTo(ScrollLock.x, ScrollLock.y);
  1147.   }
  1148. }
  1149.  
  1150.  
  1151. class Security {
  1152.  
  1153.   static init() {
  1154.     if (Detector.isStackExchangePage) {
  1155.       Security.checked = true;
  1156.       Security.check = null;
  1157.     }
  1158.     Security.init = true;
  1159.   }
  1160.  
  1161.   static async check() {
  1162.     Security.noImages = false;
  1163.     Security._resolveOnReady = [];
  1164.     Security._imageCache = new Map();
  1165.  
  1166.     const {headers} = await fetch(location.href, {
  1167.       method: 'HEAD',
  1168.       cache: 'force-cache',
  1169.       mode: 'same-origin',
  1170.       credentials: 'same-origin',
  1171.     });
  1172.     const csp = headers.get('Content-Security-Policy');
  1173.     const imgSrc = /(?:^|[\s;])img-src\s+([^;]+)/i.test(csp) && RegExp.$1.trim();
  1174.     if (imgSrc)
  1175.       Security.noImages = !/(^\s)(\*|https?:)(\s|$)/.test(imgSrc);
  1176.  
  1177.     Security._resolveOnReady.forEach(fn => fn());
  1178.     Security._resolveOnReady = null;
  1179.     Security.checked = true;
  1180.     Security.check = null;
  1181.   }
  1182.  
  1183.   /** @return Promise<void> */
  1184.   static ready() {
  1185.     return Security.checked ?
  1186.       Promise.resolve() :
  1187.       new Promise(done => Security._resolveOnReady.push(done));
  1188.   }
  1189.  
  1190.   static embedImages(...containers) {
  1191.     for (const container of containers) {
  1192.       if (!container)
  1193.         continue;
  1194.       if (Util.isIterable(container)) {
  1195.         Security.embedImages(...container);
  1196.         continue;
  1197.       }
  1198.       if (container.localName === 'img') {
  1199.         Security._embedImage(container);
  1200.         continue;
  1201.       }
  1202.       for (const img of container.getElementsByTagName('img'))
  1203.         Security._embedImage(img);
  1204.     }
  1205.   }
  1206.  
  1207.   static _embedImage(img) {
  1208.     const src = img.src;
  1209.     if (!src || src.startsWith('data:'))
  1210.       return;
  1211.     const data = Security._imageCache.get(src);
  1212.     const alreadyFetching = Array.isArray(data);
  1213.     if (alreadyFetching) {
  1214.       data.push(img);
  1215.     } else if (data) {
  1216.       img.src = data;
  1217.       return;
  1218.     } else {
  1219.       Security._imageCache.set(src, [img]);
  1220.       Security._fetchImage(src);
  1221.     }
  1222.     $.setStyle(img, ['visibility', 'hidden']);
  1223.     img.dataset.src = src;
  1224.     img.removeAttribute('src');
  1225.   }
  1226.  
  1227.   static async _fetchImage(src) {
  1228.     const r = await Urler.get({url: src, responseType: 'blob'});
  1229.     const type = Util.getResponseMimeType(r.responseHeaders);
  1230.     const blob = r.response;
  1231.     const blobType = blob.type;
  1232.     let dataUri = await Util.blobToBase64(blob);
  1233.     if (blobType !== type)
  1234.       dataUri = 'data:' + type + dataUri.slice(dataUri.indexOf(';'));
  1235.  
  1236.     const images = Security._imageCache.get(src);
  1237.     Security._imageCache.set(src, dataUri);
  1238.  
  1239.     let detached = false;
  1240.     for (const el of images) {
  1241.       el.src = dataUri;
  1242.       el.style.removeProperty('visibility');
  1243.       if (!detached && el.ownerDocument !== document)
  1244.         detached = true;
  1245.     }
  1246.  
  1247.     if (detached) {
  1248.       for (const el of $.all(`img[data-src="${src}"]`)) {
  1249.         el.src = dataUri;
  1250.         el.style.removeProperty('visibility');
  1251.       }
  1252.     }
  1253.   }
  1254. }
  1255.  
  1256.  
  1257. // eslint-disable-next-line no-redeclare
  1258. class Cache {
  1259.  
  1260.   static init() {
  1261.     Cache.timers = new Map();
  1262.     setTimeout(Cache._cleanup, 10e3);
  1263.   }
  1264.  
  1265.   static read(url) {
  1266.     const keyUrl = Urler.makeCacheable(url);
  1267.     const [time, expires, finalUrl = url] = (localStorage[keyUrl] || '').split('\t');
  1268.     const keyFinalUrl = Urler.makeCacheable(finalUrl);
  1269.     return expires > Date.now() && {
  1270.       time,
  1271.       finalUrl,
  1272.       html: LZStringUnsafe.decompressFromUTF16(localStorage[keyFinalUrl + '\thtml']),
  1273.     };
  1274.   }
  1275.  
  1276.   // standard keyUrl = time,expiry
  1277.   //          keyUrl\thtml = html
  1278.   // redirected keyUrl = time,expiry,finalUrl
  1279.   //            keyFinalUrl = time,expiry
  1280.   //            keyFinalUrl\thtml = html
  1281.   static write({url, finalUrl, html, cacheDuration = CACHE_DURATION}) {
  1282.  
  1283.     cacheDuration = Math.max(CACHE_DURATION, Math.min(0x7FFF0000, cacheDuration >> 0));
  1284.     finalUrl = (finalUrl || url).replace(/[?#].*/, '');
  1285.  
  1286.     const keyUrl = Urler.makeCacheable(url);
  1287.     const keyFinalUrl = Urler.makeCacheable(finalUrl);
  1288.     const lz = LZStringUnsafe.compressToUTF16(html);
  1289.  
  1290.     if (!Util.tryCatch(Cache._writeRaw, keyFinalUrl + '\thtml', lz)) {
  1291.       Cache._cleanup({aggressive: true});
  1292.       if (!Util.tryCatch(Cache._writeRaw, keyFinalUrl + '\thtml', lz))
  1293.         return Util.error('localStorage write error');
  1294.     }
  1295.  
  1296.     const time = Date.now();
  1297.     const expiry = time + cacheDuration;
  1298.     localStorage[keyFinalUrl] = time + '\t' + expiry;
  1299.     if (keyUrl !== keyFinalUrl)
  1300.       localStorage[keyUrl] = time + '\t' + expiry + '\t' + finalUrl;
  1301.  
  1302.     const t = setTimeout(Cache._delete, cacheDuration + 1000,
  1303.       keyUrl,
  1304.       keyFinalUrl,
  1305.       keyFinalUrl + '\thtml');
  1306.  
  1307.     for (const url of [keyUrl, keyFinalUrl]) {
  1308.       clearTimeout(Cache.timers.get(url));
  1309.       Cache.timers.set(url, t);
  1310.     }
  1311.   }
  1312.  
  1313.   static _writeRaw(k, v) {
  1314.     localStorage[k] = v;
  1315.     return true;
  1316.   }
  1317.  
  1318.   static _delete(...keys) {
  1319.     for (const k of keys) {
  1320.       delete localStorage[k];
  1321.       Cache.timers.delete(k);
  1322.     }
  1323.   }
  1324.  
  1325.   static _cleanup({aggressive = false} = {}) {
  1326.     for (const k in localStorage) {
  1327.       if ((k.startsWith('http://') || k.startsWith('https://')) &&
  1328.           !k.includes('\t')) {
  1329.         const [, expires, url] = (localStorage[k] || '').split('\t');
  1330.         if (Number(expires) > Date.now() && !aggressive)
  1331.           break;
  1332.         if (url) {
  1333.           delete localStorage[url];
  1334.           Cache.timers.delete(url);
  1335.         }
  1336.         delete localStorage[(url || k) + '\thtml'];
  1337.         delete localStorage[k];
  1338.         Cache.timers.delete(k);
  1339.       }
  1340.     }
  1341.   }
  1342. }
  1343.  
  1344.  
  1345. class Urler {
  1346.  
  1347.   static init() {
  1348.     Urler.xhr = null;
  1349.     Urler.xhrNoSSL = new Set();
  1350.     Urler.init = true;
  1351.   }
  1352.  
  1353.   static getFirstNumber(url) {
  1354.     if (typeof url === 'string')
  1355.       url = new URL(url);
  1356.     return url.pathname.match(/\/(\d+)/)[1];
  1357.   }
  1358.  
  1359.   static makeHttps(url) {
  1360.     if (!url)
  1361.       return '';
  1362.     if (url.startsWith('http:'))
  1363.       return 'https:' + url.slice(5);
  1364.     return url;
  1365.   }
  1366.  
  1367.   // strips queries and hashes and anything after the main part
  1368.   // https://site/questions/NNNNNN/title/
  1369.   static makeCacheable(url) {
  1370.     return url
  1371.       .replace(/(\/q(?:uestions)?\/\d+\/[^/]+).*/, '$1')
  1372.       .replace(/(\/a(?:nswers)?\/\d+).*/, '$1')
  1373.       .replace(/[?#].*$/, '');
  1374.   }
  1375.  
  1376.   static get(options) {
  1377.     if (!options.url)
  1378.       options = {url: options, method: 'GET'};
  1379.     if (!options.method)
  1380.       options = Object.assign({method: 'GET'}, options);
  1381.  
  1382.     let url = options.url;
  1383.     const hostname = new URL(url).hostname;
  1384.  
  1385.     if (Urler.xhrNoSSL.has(hostname)) {
  1386.       url = url.replace(/^https/, 'http');
  1387.     } else {
  1388.       url = Urler.makeHttps(url);
  1389.       const _onerror = options.onerror;
  1390.       options.onerror = () => {
  1391.         options.onerror = _onerror;
  1392.         options.url = url.replace(/^https/, 'http');
  1393.         Urler.xhrNoSSL.add(hostname);
  1394.         return Urler.get(options);
  1395.       };
  1396.     }
  1397.  
  1398.     return new Promise(resolve => {
  1399.       let xhr;
  1400.       options.onload = r => {
  1401.         if (pv.xhr === xhr)
  1402.           pv.xhr = null;
  1403.         resolve(r);
  1404.       };
  1405.       options.url = url;
  1406.       xhr = pv.xhr = GM_xmlhttpRequest(options);
  1407.     });
  1408.   }
  1409. }
  1410.  
  1411.  
  1412. class Util {
  1413.  
  1414.   static tryCatch(fn, ...args) {
  1415.     try {
  1416.       return fn(...args);
  1417.     } catch (e) {}
  1418.   }
  1419.  
  1420.   static isIterable(o) {
  1421.     return typeof o === 'object' && Symbol.iterator in o;
  1422.   }
  1423.  
  1424.   static parseHtml(html) {
  1425.     if (!Util.parser)
  1426.       Util.parser = new DOMParser();
  1427.     return Util.parser.parseFromString(html, 'text/html');
  1428.   }
  1429.  
  1430.   static extractTime(element) {
  1431.     return new Date(element.title).getTime();
  1432.   }
  1433.  
  1434.   static getResponseMimeType(headers) {
  1435.     return headers.match(/^\s*content-type:\s*(.*)|$/mi)[1] ||
  1436.            'image/png';
  1437.   }
  1438.  
  1439.   static getResponseDate(headers) {
  1440.     try {
  1441.       return new Date(headers.match(/^\s*date:\s*(.*)/mi)[1]);
  1442.     } catch (e) {}
  1443.   }
  1444.  
  1445.   static blobToBase64(blob) {
  1446.     return new Promise((resolve, reject) => {
  1447.       const reader = new FileReader();
  1448.       reader.onerror = reject;
  1449.       reader.onload = e => resolve(e.target.result);
  1450.       reader.readAsDataURL(blob);
  1451.     });
  1452.   }
  1453.  
  1454.   static async sha256(str) {
  1455.     if (!pv.utf8encoder)
  1456.       pv.utf8encoder = new TextEncoder('utf-8');
  1457.     const buf = await crypto.subtle.digest('SHA-256', pv.utf8encoder.encode(str));
  1458.     const blob = new Blob([buf]);
  1459.     const url = await Util.blobToBase64(blob);
  1460.     return url.slice(url.indexOf(',') + 1);
  1461.   }
  1462.  
  1463.   /** @param {KeyboardEvent} e */
  1464.   static hasKeyModifiers(e) {
  1465.     return e.ctrlKey || e.altKey || e.shiftKey || e.metaKey;
  1466.   }
  1467.  
  1468.   static fadeOut(el, transition) {
  1469.     return new Promise(resolve => {
  1470.       if (transition) {
  1471.         if (typeof transition === 'number')
  1472.           transition = `opacity ${transition}s ease-in-out`;
  1473.         $.setStyle(el, ['transition', transition]);
  1474.         setTimeout(doFadeOut);
  1475.       } else {
  1476.         doFadeOut();
  1477.       }
  1478.       function doFadeOut() {
  1479.         $.setStyle(el, ['opacity', '0']);
  1480.         $.on('transitionend', el, done);
  1481.         $.on('visibilitychange', el, done);
  1482.       }
  1483.       function done() {
  1484.         $.off('transitionend', el, done);
  1485.         $.off('visibilitychange', el, done);
  1486.         if (el.style.opacity === '0')
  1487.           $.setStyle(el, ['display', 'none']);
  1488.         resolve();
  1489.       }
  1490.     });
  1491.   }
  1492.  
  1493.   /** @param {KeyboardEvent} e */
  1494.   static consumeEsc(e) {
  1495.     if (e.key === 'Escape')
  1496.       e.preventDefault();
  1497.   }
  1498.  
  1499.   static error(...args) {
  1500.     console.error(GM_info.script.name, ...args);
  1501.   }
  1502. }
  1503.  
  1504.  
  1505. class Styles {
  1506.  
  1507.   static init(isDark) {
  1508.     if (Styles.isDark === isDark)
  1509.       return;
  1510.  
  1511.     Styles.isDark = isDark;
  1512.     Styles.REUSABLE = `${ID}-reusable`;
  1513.  
  1514.     const KBD_COLOR = '#0008';
  1515.  
  1516.     // language=HTML
  1517.     const SVG_ARROW = btoa(`
  1518.       <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
  1519.         <path stroke="${KBD_COLOR}" stroke-width="3" fill="none"
  1520.               d="M2.5,8.5H15 M9,2L2.5,8.5L9,15"/>
  1521.       </svg>`
  1522.       .replace(/>\s+</g, '><')
  1523.       .replace(/[\r\n]/g, ' ')
  1524.       .replace(/\s\s+/g, ' ')
  1525.       .trim()
  1526.     );
  1527.  
  1528.     const IMPORTANT = '!important;';
  1529.  
  1530.     // language=CSS
  1531.     pv.stylesOverride = [
  1532.       `
  1533.       :host {
  1534.         all: initial;
  1535.         border-color: transparent;
  1536.         display: none;
  1537.         opacity: 0;
  1538.         height: 33%;
  1539.         transition: opacity .25s cubic-bezier(.88,.02,.92,.66),
  1540.                     border-color .25s ease-in-out;
  1541.       }
  1542.       `,
  1543.  
  1544.       `
  1545.       :host {
  1546.         box-sizing: content-box;
  1547.         width: ${WIDTH}px;
  1548.         min-height: ${MIN_HEIGHT}px;
  1549.         position: fixed;
  1550.         right: 0;
  1551.         bottom: 0;
  1552.         padding: 0;
  1553.         margin: 0;
  1554.         background: white;
  1555.         box-shadow: 0 0 100px rgba(0,0,0,0.5);
  1556.         z-index: 999999;
  1557.         border-width: ${TOP_BORDER}px ${BORDER}px ${BORDER}px;
  1558.         border-style: solid;
  1559.       }
  1560.       :host(:not([style*="opacity: 1"])) {
  1561.         pointer-events: none;
  1562.       }
  1563.       :host([\\type$="question"].\\hasAnswerShelf) {
  1564.         border-image: linear-gradient(
  1565.           ${colors.question.back} 66%,
  1566.           ${colors.answer.back}) 1 1;
  1567.       }
  1568.       `.replace(/;/g, IMPORTANT),
  1569.  
  1570.       ...Object.entries(colors).map(([type, colors]) => `
  1571.         :host([\\type$="${type}"]) {
  1572.           border-color: ${colors.back} !important;
  1573.         }
  1574.       `),
  1575.  
  1576.       `
  1577.       #\\body {
  1578.         min-width: unset!important;
  1579.         box-shadow: none!important;
  1580.         padding: 0!important;
  1581.         margin: 0!important;
  1582.         background: ${colors.body.back}!important;
  1583.         color: ${colors.body.fore}!important;
  1584.         display: flex;
  1585.         flex-direction: column;
  1586.         height: 100%;
  1587.       }
  1588.  
  1589.       #\\title {
  1590.         all: unset;
  1591.         display: block;
  1592.         padding: 12px ${PADDING}px;
  1593.         font-weight: bold;
  1594.         font-size: 18px;
  1595.         line-height: 1.2;
  1596.         cursor: pointer;
  1597.       }
  1598.       #\\title:hover {
  1599.         text-decoration: underline;
  1600.         text-decoration-skip: ink;
  1601.       }
  1602.       #\\title:hover + #\\meta {
  1603.         opacity: 1.0;
  1604.       }
  1605.  
  1606.       #\\meta {
  1607.         position: absolute;
  1608.         font: bold 14px/${TOP_BORDER}px sans-serif;
  1609.         height: ${TOP_BORDER}px;
  1610.         top: -${TOP_BORDER}px;
  1611.         left: -${BORDER}px;
  1612.         right: ${BORDER * 2}px;
  1613.         padding: 0 0 0 ${BORDER + PADDING}px;
  1614.         display: flex;
  1615.         align-items: center;
  1616.         cursor: s-resize;
  1617.       }
  1618.       #\\meta b {
  1619.         height: ${TOP_BORDER}px;
  1620.         display: inline-block;
  1621.         padding: 0 6px;
  1622.         margin-left: -6px;
  1623.         margin-right: 3px;
  1624.       }
  1625.  
  1626.       #\\close {
  1627.         position: absolute;
  1628.         top: -${TOP_BORDER}px;
  1629.         right: -${BORDER}px;
  1630.         width: ${BORDER * 3}px;
  1631.         flex: none;
  1632.         cursor: pointer;
  1633.         padding: .5ex 1ex;
  1634.         font: normal 15px/1.0 sans-serif;
  1635.         color: #fff8;
  1636.       }
  1637.       #\\close:after {
  1638.         content: "x";
  1639.       }
  1640.       #\\close:active {
  1641.         background-color: rgba(0,0,0,.2);
  1642.       }
  1643.       #\\close:hover {
  1644.         background-color: rgba(0,0,0,.1);
  1645.       }
  1646.  
  1647.       #\\parts {
  1648.         position: relative;
  1649.         overflow-y: overlay; /* will replace with scrollbar-gutter once it's implemented */
  1650.         overflow-x: hidden;
  1651.         flex-grow: 2;
  1652.         outline: none;
  1653.         margin: 0;
  1654.         padding: ${PADDING}px ${PADDING - PROSE_MARGIN}px ${PADDING}px ${PADDING}px !important;
  1655.       }
  1656.       #\\parts > .question-status {
  1657.         margin: -${PADDING}px -${PADDING}px ${PADDING}px;
  1658.         padding-left: ${PADDING}px;
  1659.       }
  1660.       #\\parts .question-originals-of-duplicate {
  1661.         margin: -${PADDING}px -${PADDING}px ${PADDING}px;
  1662.         padding: ${PADDING / 2 >> 0}px ${PADDING}px;
  1663.       }
  1664.       #\\parts > .question-status h2 {
  1665.         font-weight: normal;
  1666.       }
  1667.       #\\parts a.SEpreviewable {
  1668.         text-decoration: underline !important;
  1669.         text-decoration-skip: ink;
  1670.       }
  1671.  
  1672.       #\\parts .comment-actions {
  1673.         width: 20px !important;
  1674.       }
  1675.       #\\parts .comment-edit,
  1676.       #\\parts .delete-tag,
  1677.       #\\parts .comment-actions > :not(.comment-score) {
  1678.         display: none;
  1679.       }
  1680.       #\\parts .comments {
  1681.         border-top: none;
  1682.       }
  1683.       #\\parts .comments .comment:last-child .comment-text {
  1684.         border-bottom: none;
  1685.       }
  1686.       #\\parts .comments .new-comment-highlight .comment-text {
  1687.         -webkit-animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  1688.         -moz-animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  1689.         animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  1690.       }
  1691.       #\\parts .post-menu > span {
  1692.         opacity: .35;
  1693.       }
  1694.  
  1695.       #\\parts #user-menu {
  1696.         position: absolute;
  1697.       }
  1698.       .\\userCard {
  1699.         position: absolute;
  1700.         display: none;
  1701.         transition: opacity .25s cubic-bezier(.88,.02,.92,.66) .5s;
  1702.         margin-top: -3rem;
  1703.       }
  1704.       #\\parts .wmd-preview a:not(.post-tag),
  1705.       #\\parts .postcell a:not(.post-tag),
  1706.       #\\parts .comment-copy a:not(.post-tag) {
  1707.         border-bottom: none;
  1708.       }
  1709.  
  1710.       #\\answers-title {
  1711.         margin: .5ex 1ex 0 0;
  1712.         font-size: 18px;
  1713.         line-height: 1.0;
  1714.         float: left;
  1715.       }
  1716.       #\\answers-title p {
  1717.         font-size: 11px;
  1718.         font-weight: normal;
  1719.         max-width: 8em;
  1720.         line-height: 1.0;
  1721.         margin: 1ex 0 0 0;
  1722.         padding: 0;
  1723.       }
  1724.       #\\answers-title b,
  1725.       #\\answers-title label {
  1726.         background: linear-gradient(#fff8 30%, #fff);
  1727.         width: 10px;
  1728.         height: 10px;
  1729.         padding: 2px;
  1730.         margin-right: 2px;
  1731.         box-shadow: 0 1px 3px #0008;
  1732.         border-radius: 3px;
  1733.         font-weight: normal;
  1734.         display: inline-block;
  1735.         vertical-align: middle;
  1736.       }
  1737.       #\\answers-title b::after {
  1738.         content: "";
  1739.         display: block;
  1740.         width: 100%;
  1741.         height: 100%;
  1742.         background: url('data:image/svg+xml;base64,${SVG_ARROW}') no-repeat center;
  1743.       }
  1744.       #\\answers-title b[mirrored]::after {
  1745.         transform: scaleX(-1);
  1746.       }
  1747.       #\\answers-title label {
  1748.         width: auto;
  1749.         color: ${KBD_COLOR};
  1750.       }
  1751.  
  1752.       #\\answers {
  1753.         all: unset;
  1754.         display: block;
  1755.         padding: 10px 10px 10px ${PADDING}px;
  1756.         font-weight: bold;
  1757.         line-height: 1.0;
  1758.         border-top: 4px solid ${colors.answer.back}5e;
  1759.         background-color: ${colors.answer.back}5e;
  1760.         color: ${colors.answer.fore};
  1761.         word-break: break-word;
  1762.       }
  1763.       #\\answers a {
  1764.         color: ${colors.answer.fore};
  1765.         text-decoration: none;
  1766.         font-size: 11px;
  1767.         font-family: monospace;
  1768.         width: 32px !important;
  1769.         display: inline-block;
  1770.         position: relative;
  1771.         vertical-align: top;
  1772.         margin: 0 1ex 1ex 0;
  1773.         padding: 0 0 1.1ex 0;
  1774.       }
  1775.       [\\type*="deleted"] #\\answers a {
  1776.         color: ${colors.deleted.fore};
  1777.       }
  1778.       #\\answers img {
  1779.         width: 32px;
  1780.         height: 32px;
  1781.       }
  1782.       #\\answers a.deleted-answer {
  1783.         color: ${colors.deleted.fore};
  1784.         background: transparent;
  1785.         opacity: 0.25;
  1786.       }
  1787.       #\\answers a.deleted-answer:hover {
  1788.         opacity: 1.0;
  1789.       }
  1790.       #\\answers a:hover:not(.SEpreviewed) {
  1791.         text-decoration: underline;
  1792.         text-decoration-skip: ink;
  1793.       }
  1794.       #\\answers a.SEpreviewed {
  1795.         background-color: ${colors.answer.fore};
  1796.         color: ${colors.answer.foreInv};
  1797.         outline: 4px solid ${colors.answer.fore};
  1798.       }
  1799.       #\\answers a::after {
  1800.         white-space: nowrap;
  1801.         overflow: hidden;
  1802.         text-overflow: ellipsis;
  1803.         max-width: 40px;
  1804.         position: absolute;
  1805.         content: attr(title);
  1806.         top: 44px;
  1807.         left: 0;
  1808.         font: normal .75rem/1.0 sans-serif;
  1809.         opacity: .7;
  1810.       }
  1811.       #\\answers a:only-child::after {
  1812.         max-width: calc(${WIDTH}px - 10em);
  1813.       }
  1814.       #\\answers a:hover::after {
  1815.         opacity: 1;
  1816.       }
  1817.       .\\accepted::before {
  1818.         content: "✔";
  1819.         position: absolute;
  1820.         display: block;
  1821.         top: 1.3ex;
  1822.         right: -0.7ex;
  1823.         font-size: 32px;
  1824.         color: #4bff2c;
  1825.         text-shadow: 1px 2px 2px rgba(0,0,0,0.5);
  1826.       }
  1827.  
  1828.       @-webkit-keyframes highlight {
  1829.         from {background: #ffcf78}
  1830.         to   {background: none}
  1831.       }
  1832.       `,
  1833.  
  1834.       ...Object.keys(colors).map(s => `
  1835.         #\\title {
  1836.           background-color: ${colors[s].back}5e;
  1837.           color: ${colors[s].fore};
  1838.         }
  1839.         #\\meta {
  1840.           color: ${colors[s].fore};
  1841.         }
  1842.         #\\meta b {
  1843.           color: ${colors[s].foreInv};
  1844.           background: ${colors[s].fore};
  1845.         }
  1846.         #\\close {
  1847.           color: ${colors[s].fore};
  1848.         }
  1849.         #\\parts::-webkit-scrollbar {
  1850.           background-color: ${colors[s].back}19;
  1851.         }
  1852.         #\\parts::-webkit-scrollbar-thumb {
  1853.           background-color: ${colors[s].back}32;
  1854.         }
  1855.         #\\parts::-webkit-scrollbar-thumb:hover {
  1856.           background-color: ${colors[s].back}4b;
  1857.         }
  1858.         #\\parts::-webkit-scrollbar-thumb:active {
  1859.           background-color: ${colors[s].back}c0;
  1860.         }
  1861.       `
  1862.       // language=JS
  1863.         .replace(/#\\/g, `[\\type$="${s}"] $&`)
  1864.       ),
  1865.  
  1866.       ...['deleted', 'closed'].map(s => /* language=CSS */ `
  1867.         #\\answers {
  1868.           border-top-color: ${colors[s].back}5e;
  1869.           background-color: ${colors[s].back}5e;
  1870.           color: ${colors[s].fore};
  1871.         }
  1872.         #\\answers a.SEpreviewed {
  1873.           background-color: ${colors[s].fore};
  1874.           color: ${colors[s].foreInv};
  1875.         }
  1876.         #\\answers a.SEpreviewed:after {
  1877.           border-color: ${colors[s].fore};
  1878.         }
  1879.       `
  1880.       // language=JS
  1881.         .replace(/#\\/g, `[\\type$="${s}"] $&`)
  1882.       ),
  1883.  
  1884.       GM_getResourceText(`HL-style${isDark ? '-dark' : ''}`),
  1885.     ].join('\n').replace(/\\/g, `${ID}-`);
  1886.   }
  1887.  
  1888.   static applyRemScale(id, css) {
  1889.     const el = pv.styles.get(id);
  1890.     if (pv.remScale && pv.remScale !== 1 && !pv.stylesScaled.has(id)) {
  1891.       css = (css || el.textContent).replace(/([:\s])((?:\d*\.?)?\d+)(?=rem([;}\s]|\/\*))/gi,
  1892.         (_, prev, size) => prev + (pv.remScale * size));
  1893.       pv.stylesScaled.add(id);
  1894.     }
  1895.     el.textContent = css;
  1896.   }
  1897. }
  1898.  
  1899. function $(selector, node = pv.shadow) {
  1900.   return node && node.querySelector(selector);
  1901. }
  1902.  
  1903. Object.assign($, {
  1904.  
  1905.   all(selector, node = pv.shadow) {
  1906.     return node ? [...node.querySelectorAll(selector)] : [];
  1907.   },
  1908.  
  1909.   on(eventName, node, fn, options) {
  1910.     return node.addEventListener(eventName, fn, options);
  1911.   },
  1912.  
  1913.   off(eventName, node, fn, options) {
  1914.     return node.removeEventListener(eventName, fn, options);
  1915.   },
  1916.  
  1917.   remove(selector, node = pv.shadow) {
  1918.     for (const el of node.querySelectorAll(selector))
  1919.       el.remove();
  1920.   },
  1921.  
  1922.   text(selector, node = pv.shadow) {
  1923.     const el = typeof selector === 'string' ?
  1924.       node && node.querySelector(selector) :
  1925.       selector;
  1926.     return el ? el.textContent.trim() : '';
  1927.   },
  1928.  
  1929.   create(
  1930.     selector,
  1931.     opts = {},
  1932.     children = opts.children ||
  1933.                (typeof opts !== 'object' || Util.isIterable(opts)) && opts
  1934.   ) {
  1935.     const EOL = selector.length;
  1936.     const idStart = (selector.indexOf('#') + 1 || EOL + 1) - 1;
  1937.     const clsStart = (selector.indexOf('.', idStart < EOL ? idStart : 0) + 1 || EOL + 1) - 1;
  1938.     const tagEnd = Math.min(idStart, clsStart);
  1939.     const tag = (tagEnd < EOL ? selector.slice(0, tagEnd) : selector) || opts.tag || 'div';
  1940.     const id = idStart < EOL && selector.slice(idStart + 1, clsStart) || opts.id || '';
  1941.     const cls = clsStart < EOL && selector.slice(clsStart + 1).replace(/\./g, ' ') ||
  1942.                 opts.className ||
  1943.                 '';
  1944.     const el = id && pv.shadow && pv.shadow.getElementById(id) ||
  1945.                document.createElement(tag);
  1946.     if (el.id !== id)
  1947.       el.id = id;
  1948.     if (el.className !== cls)
  1949.       el.className = cls;
  1950.     const hasOwnProperty = Object.hasOwnProperty;
  1951.     for (const key in opts) {
  1952.       if (!hasOwnProperty.call(opts, key))
  1953.         continue;
  1954.       const value = opts[key];
  1955.       switch (key) {
  1956.         case 'tag':
  1957.         case 'id':
  1958.         case 'className':
  1959.         case 'children':
  1960.           break;
  1961.         case 'dataset': {
  1962.           const dataset = el.dataset;
  1963.           for (const k in value) {
  1964.             if (hasOwnProperty.call(value, k)) {
  1965.               const v = value[k];
  1966.               if (dataset[k] !== v)
  1967.                 dataset[k] = v;
  1968.             }
  1969.           }
  1970.           break;
  1971.         }
  1972.         case 'attributes': {
  1973.           for (const k in value) {
  1974.             if (hasOwnProperty.call(value, k)) {
  1975.               const v = value[k];
  1976.               if (el.getAttribute(k) !== v)
  1977.                 el.setAttribute(k, v);
  1978.             }
  1979.           }
  1980.           break;
  1981.         }
  1982.         default:
  1983.           if (el[key] !== value)
  1984.             el[key] = value;
  1985.       }
  1986.     }
  1987.     if (children) {
  1988.       if (!hasOwnProperty.call(opts, 'textContent'))
  1989.         el.textContent = '';
  1990.       $.appendChildren(el, children);
  1991.     }
  1992.     let before, after, parent;
  1993.     if ((before = opts.before) && before !== el.nextSibling && before !== el)
  1994.       before.insertAdjacentElement('beforebegin', el);
  1995.     else if ((after = opts.after) && after !== el.previousSibling && after !== el)
  1996.       after.insertAdjacentElement('afterend', el);
  1997.     else if ((parent = opts.parent) && parent !== el.parentNode)
  1998.       parent.appendChild(el);
  1999.     return el;
  2000.   },
  2001.  
  2002.   appendChild(parent, child, shouldClone = true) {
  2003.     if (!child)
  2004.       return;
  2005.     if (child.nodeType)
  2006.       return parent.appendChild(shouldClone ? document.importNode(child, true) : child);
  2007.     if (Util.isIterable(child))
  2008.       return $.appendChildren(parent, child, shouldClone);
  2009.     else
  2010.       return parent.appendChild(document.createTextNode(child));
  2011.   },
  2012.  
  2013.   appendChildren(newParent, children) {
  2014.     if (!Util.isIterable(children))
  2015.       return $.appendChild(newParent, children);
  2016.     const fragment = document.createDocumentFragment();
  2017.     for (const el of children)
  2018.       $.appendChild(fragment, el);
  2019.     return newParent.appendChild(fragment);
  2020.   },
  2021.  
  2022.   setStyle(el, ...props) {
  2023.     const style = el.style;
  2024.     const s0 = style.cssText;
  2025.     let s = s0;
  2026.  
  2027.     for (const p of props) {
  2028.       if (!p)
  2029.         continue;
  2030.  
  2031.       const [name, value, important = true] = p;
  2032.       const rValue = value + (important && value ? ' !important' : '');
  2033.       const rx = new RegExp(`(^|[\\s;])${name}(\\s*:\\s*)([^;]*?)(\\s*(?:;|$))`, 'i');
  2034.       const m = rx.exec(s);
  2035.  
  2036.       if (!m && value) {
  2037.         const rule = name + ': ' + rValue;
  2038.         s += !s || s.endsWith(';') ? rule : '; ' + rule;
  2039.         continue;
  2040.       }
  2041.  
  2042.       if (!m && !value)
  2043.         continue;
  2044.  
  2045.       const [, sep1, sep2, oldValue, sep3] = m;
  2046.       if (value !== oldValue) {
  2047.         s = s.slice(0, m.index) +
  2048.             sep1 + (rValue ? name + sep2 + rValue + sep3 : '') +
  2049.             s.slice(m.index + m[0].length);
  2050.       }
  2051.     }
  2052.  
  2053.     if (s !== s0)
  2054.       style.cssText = s;
  2055.   },
  2056. });

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