☰

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        1.1.9
  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. const SEL_COMMENTS = '.js-follow-ups, .comments-list';
  145. const SEL_MORE = '.js-show-more-button, .js-show-link.comments-link';
  146.  
  147. const pv = {
  148.   /** @type {Target} */
  149.   target: null,
  150.   /** @type {Element} */
  151.   _frame: null,
  152.   /** @type {Element} */
  153.   get frame() {
  154.     if (!this._frame)
  155.       Preview.init();
  156.     if (!document.contains(this._frame))
  157.       document.body.appendChild(this._frame);
  158.     return this._frame;
  159.   },
  160.   set frame(element) {
  161.     this._frame = element;
  162.     return element;
  163.   },
  164.   /** @type {Post} */
  165.   post: {},
  166.   hover: {x: 0, y: 0},
  167.   stylesOverride: '',
  168. };
  169.  
  170. class Detector {
  171.  
  172.   static init() {
  173.     const {matches} = GM_info.script;
  174.     const sites = matches
  175.       .slice(0, matches.findIndex(m => m.includes('stackexchange.com')) + 1)
  176.       .map(m => m.match(/[-.\w]+/)[0]);
  177.     const rxsSites = 'https?://(\\w*\\.)*(' +
  178.       matches
  179.         .map(m => m.match(/^.*?\/\/\W*(\w.*?)\//)[1].replace(/\./g, '\\.'))
  180.         .join('|') +
  181.       ')/';
  182.     Detector.rxPreviewableSite = new RegExp(rxsSites);
  183.     Detector.rxPreviewablePost = new RegExp(rxsSites + '(questions|q|a|posts/comments)/\\d+');
  184.     Detector.pageUrls = getBaseUrls(location, Detector.rxPreviewablePost);
  185.     Detector.isStackExchangePage = Detector.rxPreviewableSite.test(location);
  186.  
  187.     const {
  188.       rxPreviewablePost,
  189.       isStackExchangePage: isSE,
  190.       pageUrls: {base, baseShort},
  191.     } = Detector;
  192.  
  193.     // array of target elements accumulated in mutation observer
  194.     // cleared in attachHoverListener
  195.     const moQueue = [];
  196.  
  197.     onMutation([{
  198.       addedNodes: [document.body],
  199.     }]);
  200.  
  201.     new MutationObserver(onMutation)
  202.       .observe(document.body, {
  203.         childList: true,
  204.         subtree: true,
  205.       });
  206.  
  207.     Detector.init = true;
  208.  
  209.     function onMutation(mutations) {
  210.       const alreadyScheduled = moQueue.length > 0;
  211.       for (const {addedNodes} of mutations) {
  212.         for (const n of addedNodes) {
  213.           if (!n.localName)
  214.             continue;
  215.           if (n.localName === 'a') {
  216.             moQueue.push(n);
  217.             continue;
  218.           }
  219.           // not using ..spreading since there could be 100k links for all we know
  220.           // and that might exceed JS engine stack limit which can be pretty low
  221.           const targets = n.getElementsByTagName('a');
  222.           for (let k = 0, len = targets.length; k < len; k++)
  223.             moQueue.push(targets[k]);
  224.           if (!isSE)
  225.             continue;
  226.           if (n.classList.contains('question-summary')) {
  227.             moQueue.push(...n.getElementsByClassName('answered'));
  228.             moQueue.push(...n.getElementsByClassName('answered-accepted'));
  229.             continue;
  230.           }
  231.           for (const el of n.getElementsByClassName('question-summary')) {
  232.             moQueue.push(...el.getElementsByClassName('answered'));
  233.             moQueue.push(...el.getElementsByClassName('answered-accepted'));
  234.           }
  235.         }
  236.       }
  237.       if (!alreadyScheduled && moQueue.length)
  238.         setTimeout(hoverize);
  239.     }
  240.  
  241.     function hoverize() {
  242.       for (const el of moQueue) {
  243.         if (el[EXPANDO] instanceof Target)
  244.           continue;
  245.         if (el.localName === 'a') {
  246.           if (isSE && el.classList.contains('js-share-link'))
  247.             continue;
  248.           const previewable = isPreviewable(el) || !isSE && isEmbeddedUrlPreviewable(el);
  249.           if (!previewable)
  250.             continue;
  251.           const url = Urler.makeHttps(el.href);
  252.           if (url.startsWith(base) || url.startsWith(baseShort))
  253.             continue;
  254.         }
  255.         Target.createHoverable(el);
  256.       }
  257.       moQueue.length = 0;
  258.     }
  259.  
  260.     function isPreviewable(a) {
  261.       let href = false;
  262.       const host = '.' + a.hostname;
  263.       const hostLen = host.length;
  264.       for (const stackSite of sites) {
  265.         if (host[hostLen - stackSite.length] === '.' &&
  266.             host.endsWith(stackSite) &&
  267.             rxPreviewablePost.test(href || (href = a.href)))
  268.           return true;
  269.       }
  270.     }
  271.  
  272.     function isEmbeddedUrlPreviewable(a) {
  273.       const url = a.href;
  274.       let i = url.indexOf('http', 1);
  275.       if (i < 0)
  276.         return false;
  277.       i = (
  278.         url.indexOf('http://', i) + 1 ||
  279.         url.indexOf('https://', i) + 1 ||
  280.         url.indexOf('http%3A%2F%2F', i) + 1 ||
  281.         url.indexOf('https%3A%2F%2F', i) + 1
  282.       ) - 1;
  283.       if (i < 0)
  284.         return false;
  285.       const j = url.indexOf('&', i);
  286.       const embeddedUrl = url.slice(i, j > 0 ? j : undefined);
  287.       return rxPreviewablePost.test(embeddedUrl);
  288.     }
  289.  
  290.     function getBaseUrls(url, rx) {
  291.       if (!rx.test(url))
  292.         return {};
  293.       const base = Urler.makeHttps(RegExp.lastMatch);
  294.       return {
  295.         base,
  296.         baseShort: base.replace('/questions/', '/q/'),
  297.       };
  298.     }
  299.   }
  300. }
  301.  
  302. /**
  303.  * @property {Element} element
  304.  * @property {Boolean} isLink
  305.  * @property {String}  url
  306.  * @property {Number}  timer
  307.  * @property {Number}  timerCursor
  308.  * @property {String}  savedCursor
  309.  */
  310. class Target {
  311.  
  312.   /** @param {Element} el */
  313.   static createHoverable(el) {
  314.     const target = new Target(el);
  315.     Object.defineProperty(el, EXPANDO, {value: target});
  316.     el.removeAttribute('title');
  317.     el.addEventListener('mouseover', Target._onMouseOver);
  318.     return target;
  319.   }
  320.  
  321.   /** @param {Element} el */
  322.   constructor(el) {
  323.     this.element = el;
  324.     this.isLink = el.localName === 'a';
  325.   }
  326.  
  327.   release() {
  328.     $.off('mousemove', this.element, Target._onMove);
  329.     $.off('mouseout', this.element, Target._onHoverEnd);
  330.     $.off('mousedown', this.element, Target._onHoverEnd);
  331.  
  332.     for (const k in this) {
  333.       if (k.startsWith('timer') && this[k] >= 1) {
  334.         clearTimeout(this[k]);
  335.         this[k] = 0;
  336.       }
  337.     }
  338.     BusyCursor.hide(this);
  339.     pv.target = null;
  340.   }
  341.  
  342.   get url() {
  343.     const el = this.element;
  344.     if (this.isLink)
  345.       return el.href;
  346.     const a = $('a', el.closest('.question-summary'));
  347.     if (a)
  348.       return a.href;
  349.   }
  350.  
  351.   /** @param {MouseEvent} e */
  352.   static _onMouseOver(e) {
  353.     if (Util.hasKeyModifiers(e))
  354.       return;
  355.     const self = /** @type {Target} */ this[EXPANDO];
  356.     if (self === Preview.target && Preview.shown() ||
  357.         self === pv.target)
  358.       return;
  359.  
  360.     if (pv.target)
  361.       pv.target.release();
  362.     pv.target = self;
  363.  
  364.     pv.hover.x = e.pageX;
  365.     pv.hover.y = e.pageY;
  366.  
  367.     $.on('mousemove', this, Target._onMove);
  368.     $.on('mouseout', this, Target._onHoverEnd);
  369.     $.on('mousedown', this, Target._onHoverEnd);
  370.  
  371.     Target._restartTimer(self);
  372.   }
  373.  
  374.   /** @param {MouseEvent} e */
  375.   static _onHoverEnd(e) {
  376.     if (e.type === 'mouseout' && e.target !== this)
  377.       return;
  378.     const self = /** @type {Target} */ this[EXPANDO];
  379.     if (pv.xhr && pv.target === self) {
  380.       pv.xhr.abort();
  381.       pv.xhr = null;
  382.     }
  383.     self.release();
  384.     self.timer = setTimeout(Target._onAbortTimer, AUTOHIDE_DELAY, self);
  385.   }
  386.  
  387.   /** @param {MouseEvent} e */
  388.   static _onMove(e) {
  389.     const stoppedMoving =
  390.       Math.abs(pv.hover.x - e.pageX) < 2 &&
  391.       Math.abs(pv.hover.y - e.pageY) < 2;
  392.     if (stoppedMoving) {
  393.       pv.hover.x = e.pageX;
  394.       pv.hover.y = e.pageY;
  395.       Target._restartTimer(this[EXPANDO]);
  396.     }
  397.   }
  398.  
  399.   /** @param {Target} self */
  400.   static _restartTimer(self) {
  401.     if (self.timer)
  402.       clearTimeout(self.timer);
  403.     self.timer = setTimeout(Target._onTimer, PREVIEW_DELAY, self);
  404.   }
  405.  
  406.   /** @param {Target} self */
  407.   static _onTimer(self) {
  408.     self.timer = 0;
  409.     const el = self.element;
  410.     if (!el.matches(':hover')) {
  411.       self.release();
  412.       return;
  413.     }
  414.     $.off('mousemove', el, Target._onMove);
  415.  
  416.     if (self.url)
  417.       Preview.start(self);
  418.   }
  419.  
  420.   /** @param {Target} self */
  421.   static _onAbortTimer(self) {
  422.     if ((self === pv.target || self === Preview.target) &&
  423.         pv.frame && !pv.frame.matches(':hover')) {
  424.       pv.target = null;
  425.       Preview.hide({fade: true});
  426.     }
  427.   }
  428. }
  429.  
  430.  
  431. class BusyCursor {
  432.  
  433.   /** @param {Target} target */
  434.   static schedule(target) {
  435.     target.timerCursor = setTimeout(BusyCursor._onTimer, BUSY_CURSOR_DELAY, target);
  436.   }
  437.  
  438.   /** @param {Target} target */
  439.   static hide(target) {
  440.     if (target.timerCursor) {
  441.       clearTimeout(target.timerCursor);
  442.       target.timerCursor = 0;
  443.     }
  444.     const style = target.element.style;
  445.     if (style.cursor === 'wait')
  446.       style.cursor = target.savedCursor;
  447.   }
  448.  
  449.   /** @param {Target} target */
  450.   static _onTimer(target) {
  451.     target.timerCursor = 0;
  452.     target.savedCursor = target.element.style.cursor;
  453.     $.setStyle(target.element, ['cursor', 'wait']);
  454.   }
  455. }
  456.  
  457.  
  458. class Preview {
  459.  
  460.   static init() {
  461.     pv.frame = $.create(`#${ID}`, {parent: document.body});
  462.     pv.shadow = pv.frame.attachShadow({mode: 'open'});
  463.     pv.body = $.create(`body#${ID}-body`, {parent: pv.shadow});
  464.  
  465.     const WRAP_AROUND = '(or wrap around to the question)';
  466.     const TITLE_PREV = 'Previous answer\n' + WRAP_AROUND;
  467.     const TITLE_NEXT = 'Next answer\n' + WRAP_AROUND;
  468.     const TITLE_ENTER = 'Return to the question\n(Enter was Return initially)';
  469.  
  470.     pv.answersTitle =
  471.       $.create(`#${ID}-answers-title`, [
  472.         'Answers:',
  473.         $.create('p', [
  474.           'Use ',
  475.           $.create('b', {title: TITLE_PREV}),
  476.           $.create('b', {title: TITLE_NEXT, attributes: {mirrored: ''}}),
  477.           $.create('label', {title: TITLE_ENTER}, 'Enter'),
  478.           ' to switch entries',
  479.         ]),
  480.       ]);
  481.  
  482.     $.on('keydown', pv.frame, Preview.onKey);
  483.     $.on('keyup', pv.frame, Util.consumeEsc);
  484.  
  485.     $.on('mouseover', pv.body, ScrollLock.enable);
  486.     $.on('click', pv.body, Preview.onClick);
  487.  
  488.     Sizer.init();
  489.     Styles.init();
  490.     Preview.init = true;
  491.   }
  492.  
  493.   /** @param {Target} target */
  494.   static async start(target) {
  495.     Preview.target = target;
  496.  
  497.     if (!Security.checked)
  498.       Security.check();
  499.  
  500.     const {url} = target;
  501.  
  502.     let data = Cache.read(url);
  503.     if (data) {
  504.       const r = await Urler.get(url, {method: 'HEAD'});
  505.       const postTime = Util.getResponseDate(r.responseHeaders);
  506.       if (postTime >= data.time)
  507.         data = null;
  508.     }
  509.  
  510.     if (!data) {
  511.       BusyCursor.schedule(target);
  512.       const {finalUrl, responseText: html} = await Urler.get(target.url);
  513.       data = {finalUrl, html, unsaved: true};
  514.       BusyCursor.hide(target);
  515.     }
  516.  
  517.     data.url = url;
  518.     data.showAnswer = !target.isLink;
  519.  
  520.     if (!Preview.prepare(data))
  521.       Preview.target = null;
  522.     else if (data.unsaved && data.lastActivity >= 1)
  523.       Preview.save(data);
  524.   }
  525.  
  526.   static save({url, finalUrl, html, lastActivity}) {
  527.     const inactiveDays = Math.max(0, (Date.now() - lastActivity) / (24 * 3600e3));
  528.     const cacheDuration = CACHE_DURATION * Math.pow(Math.log(inactiveDays + 1) + 1, 2);
  529.     setTimeout(Cache.write, 1000, {url, finalUrl, html, cacheDuration});
  530.   }
  531.  
  532.   // data is mutated: its lastActivity property is assigned!
  533.   static prepare(data) {
  534.     const {finalUrl, html, showAnswer, doc = Util.parseHtml(html)} = data;
  535.  
  536.     if (!doc || !doc.head)
  537.       return Util.error('no HEAD in the document received for', finalUrl);
  538.  
  539.     let answerId;
  540.     if (showAnswer) {
  541.       const el = $('[id^="answer-"]', doc);
  542.       answerId = el && el.id.match(/\d+/)[0];
  543.     } else {
  544.       answerId = finalUrl.match(/questions\/\d+\/[^/]+\/(\d+)|$/)[1];
  545.     }
  546.     const selector = answerId ? '#answer-' + answerId : '#question';
  547.     const thing = $(selector, doc);
  548.     const core = $(`.${answerId ? 'answer' : 'post'}cell`, thing);
  549.     if (!core)
  550.       return Util.error('No parsable post found', doc);
  551.  
  552.     const isQuestion = !answerId;
  553.     const status = isQuestion && $('[role="status"]', core);
  554.     const isClosed = status && $('[href*="closed"]', status);
  555.     const isDeleted = Boolean(core.closest('.deleted-answer'));
  556.     const type = [
  557.       isQuestion && 'question' || 'answer',
  558.       isDeleted && 'deleted',
  559.       isClosed && 'closed',
  560.     ].filter(Boolean).join(' ');
  561.     const answers = $.all('.answer', doc);
  562.     const comments = $(SEL_COMMENTS, thing);
  563.     const more = $(SEL_MORE, thing);
  564.     const lastActivity = Util.tryCatch(Util.extractTime, $('a[href*="?lastactivity"]', core)) ||
  565.                          Date.now();
  566.     Object.assign(pv, {
  567.       finalUrl,
  568.       finalUrlOfQuestion: Urler.makeCacheable(finalUrl),
  569.     });
  570.     /** @typedef Post
  571.      * @property {Document}  doc
  572.      * @property {String}    html
  573.      * @property {String}    selector
  574.      * @property {String}    type
  575.      * @property {String}    id
  576.      * @property {String}    title
  577.      * @property {Boolean}   isQuestion
  578.      * @property {Boolean}   isDeleted
  579.      * @property {Number}    lastActivity
  580.      * @property {Number}    numAnswers
  581.      * @property {Element}   core
  582.      * @property {Element}   comments
  583.      * @property {Element[]} answers
  584.      * @property {Element[]} renderParts
  585.      */
  586.     Object.assign(pv.post, {
  587.       doc,
  588.       html,
  589.       core,
  590.       selector,
  591.       answers,
  592.       comments,
  593.       type,
  594.       isQuestion,
  595.       isDeleted,
  596.       lastActivity,
  597.       id: isQuestion ? Urler.getFirstNumber(finalUrl) : answerId,
  598.       title: $('meta[property="og:title"]', doc).content,
  599.       numAnswers: answers.length,
  600.       renderParts: [
  601.         // including the parent so the right CSS kicks in
  602.         core.cloneNode(true),
  603.         comments,
  604.       ],
  605.     });
  606.  
  607.     $.remove('script', doc);
  608.     if (comments) {
  609.       Render._comments(comments);
  610.       if (more)
  611.         comments.appendChild($.create('a', {className: more.className}, more.innerText));
  612.     }
  613.     // Expanding relative URLs manually since <base> may be restricted via CSP
  614.     for (const a of $.all('a[href]:not([href*=":"])', doc))
  615.       a.href = new URL(a.getAttribute('href'), finalUrl);
  616.  
  617.     Promise.all([
  618.       pv.frame,
  619.       Preview.addStyles(),
  620.       Security.ready(),
  621.     ]).then(Preview.show);
  622.  
  623.     data.lastActivity = lastActivity;
  624.     return true;
  625.   }
  626.  
  627.   static show() {
  628.     Render.all();
  629.  
  630.     const style = getComputedStyle(pv.frame);
  631.     if (style.opacity !== '1' || style.display !== 'block') {
  632.       $.setStyle(pv.frame, ['display', 'block']);
  633.       setTimeout($.setStyle, 0, pv.frame, ['opacity', '1']);
  634.     }
  635.  
  636.     pv.parts.focus();
  637.   }
  638.  
  639.   static hide({fade = false} = {}) {
  640.     if (Preview.target) {
  641.       Preview.target.release();
  642.       Preview.target = null;
  643.     }
  644.  
  645.     pv.body.onmouseover = null;
  646.     pv.body.onclick = null;
  647.     pv.body.onkeydown = null;
  648.  
  649.     if (fade) {
  650.       Util.fadeOut(pv.frame)
  651.         .then(Preview.eraseBoxIfHidden);
  652.     } else {
  653.       $.setStyle(pv.frame,
  654.         ['opacity', '0'],
  655.         ['display', 'none']);
  656.       Preview.eraseBoxIfHidden();
  657.     }
  658.   }
  659.  
  660.   static shown() {
  661.     return pv.frame.style.opacity === '1';
  662.   }
  663.  
  664.   /** @param {KeyboardEvent} e */
  665.   static onKey(e) {
  666.     switch (e.key) {
  667.       case 'Escape':
  668.         Preview.hide({fade: true});
  669.         break;
  670.       case 'ArrowUp':
  671.       case 'PageUp':
  672.         if (pv.parts.scrollTop)
  673.           return;
  674.         break;
  675.       case 'ArrowDown':
  676.       case 'PageDown': {
  677.         const {scrollTop: t, clientHeight: h, scrollHeight} = pv.parts;
  678.         if (t + h < scrollHeight)
  679.           return;
  680.         break;
  681.       }
  682.       case 'ArrowLeft':
  683.       case 'ArrowRight': {
  684.         if (!pv.post.numAnswers)
  685.           return;
  686.         // current is 0 if isQuestion, 1 is the first answer
  687.         const answers = $.all(`#${ID}-answers a`);
  688.         const current = pv.post.numAnswers ?
  689.           answers.indexOf($('.SEpreviewed')) + 1 :
  690.           pv.post.isQuestion ? 0 : 1;
  691.         const num = pv.post.numAnswers + 1;
  692.         const dir = e.key === 'ArrowLeft' ? -1 : 1;
  693.         const toShow = (current + dir + num) % num;
  694.         const a = toShow ? answers[toShow - 1] : $(`#${ID}-title`);
  695.         a.click();
  696.         break;
  697.       }
  698.       case 'Enter':
  699.         if (pv.post.isQuestion)
  700.           return;
  701.         $(`#${ID}-title`).click();
  702.         break;
  703.       default:
  704.         return;
  705.     }
  706.     e.preventDefault();
  707.   }
  708.  
  709.   /** @param {MouseEvent} e */
  710.   static onClick(e) {
  711.     if (e.target.id === `${ID}-close`) {
  712.       Preview.hide();
  713.       return;
  714.     }
  715.  
  716.     const link = e.target.closest('a');
  717.     if (!link)
  718.       return;
  719.  
  720.     if (link.matches(SEL_MORE)) {
  721.       Util.fadeOut(link, 0.5);
  722.       Preview.loadComments();
  723.       e.preventDefault();
  724.       return;
  725.     }
  726.  
  727.     if (e.button ||
  728.         Util.hasKeyModifiers(e) ||
  729.         !link.matches('.SEpreviewable')) {
  730.       link.target = '_blank';
  731.       return;
  732.     }
  733.  
  734.     e.preventDefault();
  735.  
  736.     const {doc} = pv.post;
  737.     if (link.id === `${ID}-title`)
  738.       Preview.prepare({doc, finalUrl: pv.finalUrlOfQuestion});
  739.     else if (link.matches(`#${ID}-answers a`))
  740.       Preview.prepare({doc, finalUrl: pv.finalUrlOfQuestion + '/' + Urler.getFirstNumber(link)});
  741.     else
  742.       Preview.start(new Target(link));
  743.   }
  744.  
  745.   static eraseBoxIfHidden() {
  746.     if (!Preview.shown())
  747.       pv.body.textContent = '';
  748.   }
  749.  
  750.   static setHeight(height) {
  751.     const currentHeight = pv.frame.clientHeight;
  752.     const borderHeight = pv.frame.offsetHeight - currentHeight;
  753.     const newHeight = Math.max(MIN_HEIGHT, Math.min(innerHeight - borderHeight, height));
  754.     if (newHeight !== currentHeight)
  755.       $.setStyle(pv.frame, ['height', newHeight + 'px']);
  756.   }
  757.  
  758.   static async addStyles() {
  759.     const isDark = matchMedia('(prefers-color-scheme: dark)').matches;
  760.     colors = isDark ? COLORS_DARK : COLORS_LIGHT;
  761.     pv.body.className = isDark ? 'theme-dark' : '';
  762.     Styles.init(isDark);
  763.  
  764.     let last = $.create(`style#${ID}-styles.${Styles.REUSABLE}`, {
  765.       textContent: pv.stylesOverride,
  766.       before: pv.shadow.firstChild,
  767.     });
  768.  
  769.     if (!pv.styles) {
  770.       pv.styles = new Map();
  771.       pv.stylesScaled = new Set();
  772.     }
  773.  
  774.     const toDownload = [];
  775.     const sourceElements = $.all('link[rel="stylesheet"], style', pv.post.doc);
  776.  
  777.     for (const {href, textContent, localName} of sourceElements) {
  778.       const isLink = localName === 'link';
  779.       const id = ID + '-style-' + (isLink ? href : await Util.sha256(textContent));
  780.       const el = pv.styles.get(id);
  781.       if (!el && isLink)
  782.         toDownload.push(Urler.get({url: href, context: id}));
  783.       last = $.create('style', {
  784.         id,
  785.         className: Styles.REUSABLE,
  786.         textContent: isLink ? $.text(el) : textContent,
  787.         after: last,
  788.       });
  789.       pv.styles.set(id, last);
  790.     }
  791.  
  792.     const downloaded = await Promise.all(toDownload);
  793.  
  794.     for (const {responseText, context: id} of downloaded)
  795.       Styles.applyRemScale(id, responseText);
  796.  
  797.     if (!pv.remScale) {
  798.       pv.remScale = parseFloat(getComputedStyle(pv.body).fontSize) /
  799.                     parseFloat(getComputedStyle(document.documentElement).fontSize);
  800.       if (pv.remScale !== 1)
  801.         for (const id of pv.styles.keys())
  802.           Styles.applyRemScale(id);
  803.     }
  804.   }
  805.  
  806.   static async loadComments() {
  807.     const list = pv.post.comments;
  808.     const url = new URL(pv.finalUrl).origin + '/posts/' + pv.post.id.match(/\d+/)[0] + '/comments';
  809.     const doc = Util.parseHtml((await Urler.get(url)).responseText);
  810.     const oldIds = new Set([...list.children].map(e => e.id));
  811.  
  812.     Render._comments(doc);
  813.     list.textContent = '';
  814.     list.append(...doc.body.children);
  815.     for (const cmt of list.children) {
  816.       if (!oldIds.has(cmt.id))
  817.         cmt.classList.add('new-comment-highlight');
  818.     }
  819.  
  820.     Render.previewableLinks(list);
  821.     Render.hoverableUsers(list);
  822.   }
  823. }
  824.  
  825.  
  826. class Render {
  827.  
  828.   static all() {
  829.     pv.frame.classList.toggle(`${ID}-hasAnswerShelf`, pv.post.numAnswers > 0);
  830.     pv.frame.setAttribute(`${ID}-type`, pv.post.type);
  831.     pv.body.setAttribute(`${ID}-type`, pv.post.type);
  832.  
  833.     $.create(`a#${ID}-title.SEpreviewable`, {
  834.       href: pv.finalUrlOfQuestion,
  835.       textContent: pv.post.title,
  836.       parent: pv.body,
  837.     });
  838.  
  839.     $.create(`#${ID}-close`, {
  840.       title: 'Or press Esc key while the preview is focused (also when just shown)',
  841.       parent: pv.body,
  842.     });
  843.  
  844.     $.create(`#${ID}-meta`, {
  845.       parent: pv.body,
  846.       onmousedown: Sizer.onMouseDown,
  847.       children: [
  848.         Render._votes(),
  849.         pv.post.isQuestion
  850.           ? Render._questionMeta()
  851.           : Render._answerMeta(),
  852.       ],
  853.     });
  854.  
  855.     Render.previewableLinks(pv.post.doc);
  856.  
  857.     // rendering answers should happen before pv.body is processed
  858.     const shelf = pv.post.numAnswers &&
  859.       pv.post.answers.reduce(Render._answer, [pv.answersTitle]);
  860.  
  861.     if (Security.noImages)
  862.       Security.embedImages(...pv.post.renderParts);
  863.  
  864.     pv.parts = $.create(`#${ID}-parts`, {
  865.       className: pv.post.isDeleted ? 'deleted-answer' : '',
  866.       tabIndex: 0,
  867.       scrollTop: 0,
  868.       parent: pv.body,
  869.       children: pv.post.renderParts,
  870.     });
  871.     Render.hoverableUsers(pv.parts);
  872.  
  873.     if (shelf) {
  874.       $.create(`#${ID}-answers`, {parent: pv.body}, shelf);
  875.     } else {
  876.       $.remove(`#${ID}-answers`, pv.body);
  877.     }
  878.  
  879.     const ACTIONS_SEL = '.js-post-menu > div';
  880.     const elActions = $(ACTIONS_SEL);
  881.  
  882.     // delinkify/remove non-functional items in post-menu
  883.     $.remove('.js-share-link, .flag-post-link', pv.body);
  884.     for (const el of $.all(`${ACTIONS_SEL} button`)) {
  885.       const elWrapper = el.closest(`${ACTIONS_SEL} > div`);
  886.       if (elWrapper) elWrapper.remove();
  887.     }
  888.  
  889.     // add a timeline link
  890.     elActions.append(
  891.       $.create('div.' + elActions.firstElementChild.className, [
  892.         $.create('a', {href: `/posts/${pv.post.id}/timeline`}, 'Timeline'),
  893.       ])
  894.     );
  895.  
  896.     // prettify code blocks
  897.     hljs.configure({
  898.       languages: [
  899.         ...$.all('.post-taglist .post-tag', pv.post.doc).map($.text),
  900.         'javascript',
  901.         'html',
  902.       ],
  903.     });
  904.     $.all('pre > code').forEach(el => {
  905.       el = el.parentElement;
  906.       el.className = el.className.replace(/((?:^|\s)lang-)bsh(?=\s|$)/, '$1powershell');
  907.       hljs.highlightBlock(el);
  908.     });
  909.  
  910.     const leftovers = $.all('style, link, script');
  911.     for (const el of leftovers) {
  912.       if (el.classList.contains(Styles.REUSABLE))
  913.         el.classList.remove(Styles.REUSABLE);
  914.       else
  915.         el.remove();
  916.     }
  917.  
  918.     pv.post.html = null;
  919.     pv.post.core = null;
  920.     pv.post.renderParts = null;
  921.     pv.post.answers = null;
  922.   }
  923.  
  924.   /** @param {Element} container */
  925.   static previewableLinks(container) {
  926.     for (const a of $.all('a:not(.SEpreviewable)', container)) {
  927.       let href = a.getAttribute('href');
  928.       if (!href)
  929.         continue;
  930.       if (!href.includes('://')) {
  931.         href = a.href;
  932.         a.setAttribute('href', href);
  933.       }
  934.       if (Detector.rxPreviewablePost.test(href)) {
  935.         a.removeAttribute('title');
  936.         a.classList.add('SEpreviewable');
  937.       }
  938.     }
  939.   }
  940.  
  941.   /** @param {Element} container */
  942.   static hoverableUsers(container) {
  943.     for (const a of $.all('a[href*="/users/"]', container)) {
  944.       if (Detector.rxPreviewableSite.test(a.href) &&
  945.           a.pathname.match(/^\/users\/\d+/)) {
  946.         a.onmouseover = UserCard.onUserLinkHovered;
  947.         a.classList.add(`${ID}-userLink`);
  948.       }
  949.     }
  950.   }
  951.  
  952.   static _answer(res, 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.     res.push(a, ' ');
  978.     return res;
  979.   }
  980.  
  981.   static _comments(list) {
  982.     for (let el of $.all('.js-comment-body + div', list)) {
  983.       el.textContent = +$('.js-vote-button', el).textContent.trim() || '\xA0';
  984.       if ((el = el.nextElementSibling)) el.remove();
  985.     }
  986.     $.remove('.edit-comment-form', list);
  987.     for (const el of $.all('.comment-actions', list))
  988.       el.textContent = +el.innerText || '\xA0';
  989.     list.className = '';
  990.   }
  991.  
  992.   static _votes() {
  993.     const votes = $.text('.js-vote-count', pv.post.core.closest('.post-layout'));
  994.     if (Number(votes))
  995.       return $.create('b', `${votes} vote${Math.abs(votes) >= 2 ? 's' : ''}`);
  996.   }
  997.  
  998.   static _questionMeta() {
  999.     try {
  1000.       return [...$('time', pv.post.doc).closest('.grid').children]
  1001.         .map(el => el.textContent.trim())
  1002.         .map((s, i) => (i ? s.toLowerCase() : s))
  1003.         .join(', ');
  1004.     } catch (e) {
  1005.       return '';
  1006.     }
  1007.   }
  1008.  
  1009.   static _answerMeta() {
  1010.     return $.all('.user-action-time', pv.post.core.closest('.answer'))
  1011.       .reverse()
  1012.       .map($.text)
  1013.       .join(', ');
  1014.   }
  1015. }
  1016.  
  1017.  
  1018. class UserCard {
  1019.  
  1020.   _fadeIn() {
  1021.     this._retakeId(this);
  1022.     $.setStyle(this.element,
  1023.       ['opacity', '0'],
  1024.       ['display', 'block']);
  1025.     this.timer = setTimeout(() => {
  1026.       if (this.timer)
  1027.         $.setStyle(this.element, ['opacity', '1']);
  1028.     });
  1029.   }
  1030.  
  1031.   _retakeId() {
  1032.     if (this.element.id !== 'user-menu') {
  1033.       const oldCard = $('#user-menu');
  1034.       if (oldCard)
  1035.         oldCard.id = oldCard.style.display = '';
  1036.       this.element.id = 'user-menu';
  1037.     }
  1038.   }
  1039.  
  1040.   // 'this' is the hoverable link enclosing the user's name/avatar
  1041.   static onUserLinkHovered() {
  1042.     clearTimeout(this[EXPANDO]);
  1043.     this[EXPANDO] = setTimeout(UserCard._show, PREVIEW_DELAY * 2, this);
  1044.   }
  1045.  
  1046.   /** @param {HTMLAnchorElement} a */
  1047.   static async _show(a) {
  1048.     if (!a.matches(':hover'))
  1049.       return;
  1050.     const el = a.nextElementSibling;
  1051.     const card = el && el.matches(`.${ID}-userCard`) && el[EXPANDO] ||
  1052.                  await UserCard._create(a);
  1053.     card._fadeIn();
  1054.   }
  1055.  
  1056.   /** @param {HTMLAnchorElement} a */
  1057.   static async _create(a) {
  1058.     const url = a.origin + '/users/user-info/' + Urler.getFirstNumber(a);
  1059.     let {html} = Cache.read(url) || {};
  1060.     if (!html) {
  1061.       html = (await Urler.get(url)).responseText;
  1062.       Cache.write({url, html, cacheDuration: CACHE_DURATION * 100});
  1063.     }
  1064.  
  1065.     const dom = Util.parseHtml(html);
  1066.     if (Security.noImages)
  1067.       Security.embedImages(dom);
  1068.  
  1069.     const b = a.getBoundingClientRect();
  1070.     const pb = pv.parts.getBoundingClientRect();
  1071.     const left = Math.min(b.left - 20, pb.right - 350) - pb.left + 'px';
  1072.     const isClipped = b.bottom + 100 > pb.bottom;
  1073.  
  1074.     const el = $.create(`#user-menu-tmp.${ID}-userCard`, {
  1075.       attributes: {
  1076.         style: `left: ${left} !important;` +
  1077.                (isClipped ? 'margin-top: -5rem !important;' : ''),
  1078.       },
  1079.       onmouseout: UserCard._onMouseOut,
  1080.       children: dom.body.children,
  1081.       after: a,
  1082.     });
  1083.  
  1084.     const card = new UserCard(el);
  1085.     Object.defineProperty(el, EXPANDO, {value: card});
  1086.     card.element = el;
  1087.     return card;
  1088.   }
  1089.  
  1090.   /** @param {MouseEvent} e */
  1091.   static _onMouseOut(e) {
  1092.     if (this.matches(':hover') ||
  1093.         this.style.opacity === '0' /* fading out already */)
  1094.       return;
  1095.  
  1096.     const self = /** @type {UserCard} */ this[EXPANDO];
  1097.     clearTimeout(self.timer);
  1098.     self.timer = 0;
  1099.  
  1100.     Util.fadeOut(this);
  1101.   }
  1102. }
  1103.  
  1104.  
  1105. class Sizer {
  1106.  
  1107.   static init() {
  1108.     Preview.setHeight(GM_getValue('height', innerHeight / 3) >> 0);
  1109.   }
  1110.  
  1111.   /** @param {MouseEvent} e */
  1112.   static onMouseDown(e) {
  1113.     if (e.button !== 0 || Util.hasKeyModifiers(e))
  1114.       return;
  1115.     Sizer._heightDelta = innerHeight - e.clientY - pv.frame.clientHeight;
  1116.     $.on('mousemove', document, Sizer._onMouseMove);
  1117.     $.on('mouseup', document, Sizer._onMouseUp);
  1118.   }
  1119.  
  1120.   /** @param {MouseEvent} e */
  1121.   static _onMouseMove(e) {
  1122.     Preview.setHeight(innerHeight - e.clientY - Sizer._heightDelta);
  1123.     getSelection().removeAllRanges();
  1124.   }
  1125.  
  1126.   /** @param {MouseEvent} e */
  1127.   static _onMouseUp(e) {
  1128.     GM_setValue('height', pv.frame.clientHeight);
  1129.     $.off('mouseup', document, Sizer._onMouseUp);
  1130.     $.off('mousemove', document, Sizer._onMouseMove);
  1131.   }
  1132. }
  1133.  
  1134.  
  1135. class ScrollLock {
  1136.  
  1137.   static enable() {
  1138.     if (ScrollLock.active)
  1139.       return;
  1140.     ScrollLock.active = true;
  1141.     ScrollLock.x = scrollX;
  1142.     ScrollLock.y = scrollY;
  1143.     $.on('mouseover', document.body, ScrollLock._onMouseOver);
  1144.     $.on('scroll', document, ScrollLock._onScroll);
  1145.   }
  1146.  
  1147.   static disable() {
  1148.     ScrollLock.active = false;
  1149.     $.off('mouseover', document.body, ScrollLock._onMouseOver);
  1150.     $.off('scroll', document, ScrollLock._onScroll);
  1151.   }
  1152.  
  1153.   static _onMouseOver() {
  1154.     if (ScrollLock.active)
  1155.       ScrollLock.disable();
  1156.   }
  1157.  
  1158.   static _onScroll() {
  1159.     scrollTo(ScrollLock.x, ScrollLock.y);
  1160.   }
  1161. }
  1162.  
  1163.  
  1164. class Security {
  1165.  
  1166.   static init() {
  1167.     if (Detector.isStackExchangePage) {
  1168.       Security.checked = true;
  1169.       Security.check = null;
  1170.     }
  1171.     Security.init = true;
  1172.   }
  1173.  
  1174.   static async check() {
  1175.     Security.noImages = false;
  1176.     Security._resolveOnReady = [];
  1177.     Security._imageCache = new Map();
  1178.  
  1179.     const {headers} = await fetch(location.href, {
  1180.       method: 'HEAD',
  1181.       cache: 'force-cache',
  1182.       mode: 'same-origin',
  1183.       credentials: 'same-origin',
  1184.     });
  1185.     const csp = headers.get('Content-Security-Policy');
  1186.     const imgSrc = /(?:^|[\s;])img-src\s+([^;]+)/i.test(csp) && RegExp.$1.trim();
  1187.     if (imgSrc)
  1188.       Security.noImages = !/(^\s)(\*|https?:)(\s|$)/.test(imgSrc);
  1189.  
  1190.     Security._resolveOnReady.forEach(fn => fn());
  1191.     Security._resolveOnReady = null;
  1192.     Security.checked = true;
  1193.     Security.check = null;
  1194.   }
  1195.  
  1196.   /** @return Promise<void> */
  1197.   static ready() {
  1198.     return Security.checked ?
  1199.       Promise.resolve() :
  1200.       new Promise(done => Security._resolveOnReady.push(done));
  1201.   }
  1202.  
  1203.   static embedImages(...containers) {
  1204.     for (const container of containers) {
  1205.       if (!container)
  1206.         continue;
  1207.       if (Util.isIterable(container)) {
  1208.         Security.embedImages(...container);
  1209.         continue;
  1210.       }
  1211.       if (container.localName === 'img') {
  1212.         Security._embedImage(container);
  1213.         continue;
  1214.       }
  1215.       for (const img of container.getElementsByTagName('img'))
  1216.         Security._embedImage(img);
  1217.     }
  1218.   }
  1219.  
  1220.   static _embedImage(img) {
  1221.     const src = img.src;
  1222.     if (!src || src.startsWith('data:'))
  1223.       return;
  1224.     const data = Security._imageCache.get(src);
  1225.     const alreadyFetching = Array.isArray(data);
  1226.     if (alreadyFetching) {
  1227.       data.push(img);
  1228.     } else if (data) {
  1229.       img.src = data;
  1230.       return;
  1231.     } else {
  1232.       Security._imageCache.set(src, [img]);
  1233.       Security._fetchImage(src);
  1234.     }
  1235.     $.setStyle(img, ['visibility', 'hidden']);
  1236.     img.dataset.src = src;
  1237.     img.removeAttribute('src');
  1238.   }
  1239.  
  1240.   static async _fetchImage(src) {
  1241.     const r = await Urler.get({url: src, responseType: 'blob'});
  1242.     const type = Util.getResponseMimeType(r.responseHeaders);
  1243.     const blob = r.response;
  1244.     const blobType = blob.type;
  1245.     let dataUri = await Util.blobToBase64(blob);
  1246.     if (blobType !== type)
  1247.       dataUri = 'data:' + type + dataUri.slice(dataUri.indexOf(';'));
  1248.  
  1249.     const images = Security._imageCache.get(src);
  1250.     Security._imageCache.set(src, dataUri);
  1251.  
  1252.     let detached = false;
  1253.     for (const el of images) {
  1254.       el.src = dataUri;
  1255.       el.style.removeProperty('visibility');
  1256.       if (!detached && el.ownerDocument !== document)
  1257.         detached = true;
  1258.     }
  1259.  
  1260.     if (detached) {
  1261.       for (const el of $.all(`img[data-src="${src}"]`)) {
  1262.         el.src = dataUri;
  1263.         el.style.removeProperty('visibility');
  1264.       }
  1265.     }
  1266.   }
  1267. }
  1268.  
  1269.  
  1270. // eslint-disable-next-line no-redeclare
  1271. class Cache {
  1272.  
  1273.   static init() {
  1274.     Cache.timers = new Map();
  1275.     setTimeout(Cache._cleanup, 10e3);
  1276.   }
  1277.  
  1278.   static read(url) {
  1279.     const keyUrl = Urler.makeCacheable(url);
  1280.     const [time, expires, finalUrl = url] = (localStorage[keyUrl] || '').split('\t');
  1281.     const keyFinalUrl = Urler.makeCacheable(finalUrl);
  1282.     return expires > Date.now() && {
  1283.       time,
  1284.       finalUrl,
  1285.       html: LZStringUnsafe.decompressFromUTF16(localStorage[keyFinalUrl + '\thtml']),
  1286.     };
  1287.   }
  1288.  
  1289.   // standard keyUrl = time,expiry
  1290.   //          keyUrl\thtml = html
  1291.   // redirected keyUrl = time,expiry,finalUrl
  1292.   //            keyFinalUrl = time,expiry
  1293.   //            keyFinalUrl\thtml = html
  1294.   static write({url, finalUrl, html, cacheDuration = CACHE_DURATION}) {
  1295.  
  1296.     cacheDuration = Math.max(CACHE_DURATION, Math.min(0x7FFF0000, cacheDuration >> 0));
  1297.     finalUrl = (finalUrl || url).replace(/[?#].*/, '');
  1298.  
  1299.     const keyUrl = Urler.makeCacheable(url);
  1300.     const keyFinalUrl = Urler.makeCacheable(finalUrl);
  1301.     const lz = LZStringUnsafe.compressToUTF16(html);
  1302.  
  1303.     if (!Util.tryCatch(Cache._writeRaw, keyFinalUrl + '\thtml', lz)) {
  1304.       Cache._cleanup({aggressive: true});
  1305.       if (!Util.tryCatch(Cache._writeRaw, keyFinalUrl + '\thtml', lz))
  1306.         return Util.error('localStorage write error');
  1307.     }
  1308.  
  1309.     const time = Date.now();
  1310.     const expiry = time + cacheDuration;
  1311.     localStorage[keyFinalUrl] = time + '\t' + expiry;
  1312.     if (keyUrl !== keyFinalUrl)
  1313.       localStorage[keyUrl] = time + '\t' + expiry + '\t' + finalUrl;
  1314.  
  1315.     const t = setTimeout(Cache._delete, cacheDuration + 1000,
  1316.       keyUrl,
  1317.       keyFinalUrl,
  1318.       keyFinalUrl + '\thtml');
  1319.  
  1320.     for (const url of [keyUrl, keyFinalUrl]) {
  1321.       clearTimeout(Cache.timers.get(url));
  1322.       Cache.timers.set(url, t);
  1323.     }
  1324.   }
  1325.  
  1326.   static _writeRaw(k, v) {
  1327.     localStorage[k] = v;
  1328.     return true;
  1329.   }
  1330.  
  1331.   static _delete(...keys) {
  1332.     for (const k of keys) {
  1333.       delete localStorage[k];
  1334.       Cache.timers.delete(k);
  1335.     }
  1336.   }
  1337.  
  1338.   static _cleanup({aggressive = false} = {}) {
  1339.     for (const k in localStorage) {
  1340.       if ((k.startsWith('http://') || k.startsWith('https://')) &&
  1341.           !k.includes('\t')) {
  1342.         const [, expires, url] = (localStorage[k] || '').split('\t');
  1343.         if (Number(expires) > Date.now() && !aggressive)
  1344.           break;
  1345.         if (url) {
  1346.           delete localStorage[url];
  1347.           Cache.timers.delete(url);
  1348.         }
  1349.         delete localStorage[(url || k) + '\thtml'];
  1350.         delete localStorage[k];
  1351.         Cache.timers.delete(k);
  1352.       }
  1353.     }
  1354.   }
  1355. }
  1356.  
  1357.  
  1358. class Urler {
  1359.  
  1360.   static init() {
  1361.     Urler.xhr = null;
  1362.     Urler.xhrNoSSL = new Set();
  1363.     Urler.init = true;
  1364.   }
  1365.  
  1366.   static getFirstNumber(url) {
  1367.     if (typeof url === 'string')
  1368.       url = new URL(url);
  1369.     return url.pathname.match(/\/(\d+)/)[1];
  1370.   }
  1371.  
  1372.   static makeHttps(url) {
  1373.     if (!url)
  1374.       return '';
  1375.     if (url.startsWith('http:'))
  1376.       return 'https:' + url.slice(5);
  1377.     return url;
  1378.   }
  1379.  
  1380.   // strips queries and hashes and anything after the main part
  1381.   // https://site/questions/NNNNNN/title/
  1382.   static makeCacheable(url) {
  1383.     return url
  1384.       .replace(/(\/q(?:uestions)?\/\d+\/[^/]+).*/, '$1')
  1385.       .replace(/(\/a(?:nswers)?\/\d+).*/, '$1')
  1386.       .replace(/[?#].*$/, '');
  1387.   }
  1388.  
  1389.   static get(options) {
  1390.     if (!options.url)
  1391.       options = {url: options, method: 'GET'};
  1392.     if (!options.method)
  1393.       options = Object.assign({method: 'GET'}, options);
  1394.  
  1395.     let url = options.url;
  1396.     const hostname = new URL(url).hostname;
  1397.  
  1398.     if (Urler.xhrNoSSL.has(hostname)) {
  1399.       url = url.replace(/^https/, 'http');
  1400.     } else {
  1401.       url = Urler.makeHttps(url);
  1402.       const _onerror = options.onerror;
  1403.       options.onerror = () => {
  1404.         options.onerror = _onerror;
  1405.         options.url = url.replace(/^https/, 'http');
  1406.         Urler.xhrNoSSL.add(hostname);
  1407.         return Urler.get(options);
  1408.       };
  1409.     }
  1410.  
  1411.     return new Promise(resolve => {
  1412.       let xhr;
  1413.       options.onload = r => {
  1414.         if (pv.xhr === xhr)
  1415.           pv.xhr = null;
  1416.         resolve(r);
  1417.       };
  1418.       options.url = url;
  1419.       xhr = pv.xhr = GM_xmlhttpRequest(options);
  1420.     });
  1421.   }
  1422. }
  1423.  
  1424.  
  1425. class Util {
  1426.  
  1427.   static tryCatch(fn, ...args) {
  1428.     try {
  1429.       return fn(...args);
  1430.     } catch (e) {}
  1431.   }
  1432.  
  1433.   static isIterable(o) {
  1434.     return typeof o === 'object' && Symbol.iterator in o;
  1435.   }
  1436.  
  1437.   static parseHtml(html) {
  1438.     if (!Util.parser)
  1439.       Util.parser = new DOMParser();
  1440.     return Util.parser.parseFromString(html, 'text/html');
  1441.   }
  1442.  
  1443.   static extractTime(element) {
  1444.     return new Date(element.title).getTime();
  1445.   }
  1446.  
  1447.   static getResponseMimeType(headers) {
  1448.     return headers.match(/^\s*content-type:\s*(.*)|$/mi)[1] ||
  1449.            'image/png';
  1450.   }
  1451.  
  1452.   static getResponseDate(headers) {
  1453.     try {
  1454.       return new Date(headers.match(/^\s*date:\s*(.*)/mi)[1]);
  1455.     } catch (e) {}
  1456.   }
  1457.  
  1458.   static blobToBase64(blob) {
  1459.     return new Promise((resolve, reject) => {
  1460.       const reader = new FileReader();
  1461.       reader.onerror = reject;
  1462.       reader.onload = e => resolve(e.target.result);
  1463.       reader.readAsDataURL(blob);
  1464.     });
  1465.   }
  1466.  
  1467.   static async sha256(str) {
  1468.     if (!pv.utf8encoder)
  1469.       pv.utf8encoder = new TextEncoder('utf-8');
  1470.     const buf = await crypto.subtle.digest('SHA-256', pv.utf8encoder.encode(str));
  1471.     const blob = new Blob([buf]);
  1472.     const url = await Util.blobToBase64(blob);
  1473.     return url.slice(url.indexOf(',') + 1);
  1474.   }
  1475.  
  1476.   /** @param {KeyboardEvent} e */
  1477.   static hasKeyModifiers(e) {
  1478.     return e.ctrlKey || e.altKey || e.shiftKey || e.metaKey;
  1479.   }
  1480.  
  1481.   static fadeOut(el, transition) {
  1482.     return new Promise(resolve => {
  1483.       if (transition) {
  1484.         if (typeof transition === 'number')
  1485.           transition = `opacity ${transition}s ease-in-out`;
  1486.         $.setStyle(el, ['transition', transition]);
  1487.         setTimeout(doFadeOut);
  1488.       } else {
  1489.         doFadeOut();
  1490.       }
  1491.       function doFadeOut() {
  1492.         $.setStyle(el, ['opacity', '0']);
  1493.         $.on('transitionend', el, done);
  1494.         $.on('visibilitychange', el, done);
  1495.       }
  1496.       function done() {
  1497.         $.off('transitionend', el, done);
  1498.         $.off('visibilitychange', el, done);
  1499.         if (el.style.opacity === '0')
  1500.           $.setStyle(el, ['display', 'none']);
  1501.         resolve();
  1502.       }
  1503.     });
  1504.   }
  1505.  
  1506.   /** @param {KeyboardEvent} e */
  1507.   static consumeEsc(e) {
  1508.     if (e.key === 'Escape')
  1509.       e.preventDefault();
  1510.   }
  1511.  
  1512.   static error(...args) {
  1513.     console.error(GM_info.script.name, ...args);
  1514.   }
  1515. }
  1516.  
  1517.  
  1518. class Styles {
  1519.  
  1520.   static init(isDark) {
  1521.     if (Styles.isDark === isDark)
  1522.       return;
  1523.  
  1524.     Styles.isDark = isDark;
  1525.     Styles.REUSABLE = `${ID}-reusable`;
  1526.  
  1527.     const KBD_COLOR = '#0008';
  1528.  
  1529.     // language=HTML
  1530.     const SVG_ARROW = btoa(`
  1531.       <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
  1532.         <path stroke="${KBD_COLOR}" stroke-width="3" fill="none"
  1533.               d="M2.5,8.5H15 M9,2L2.5,8.5L9,15"/>
  1534.       </svg>`
  1535.       .replace(/>\s+</g, '><')
  1536.       .replace(/[\r\n]/g, ' ')
  1537.       .replace(/\s\s+/g, ' ')
  1538.       .trim()
  1539.     );
  1540.  
  1541.     const IMPORTANT = '!important;';
  1542.  
  1543.     // language=CSS
  1544.     pv.stylesOverride = [
  1545.       `
  1546.       :host {
  1547.         all: initial;
  1548.         border-color: transparent;
  1549.         display: none;
  1550.         opacity: 0;
  1551.         height: 33%;
  1552.         transition: opacity .25s cubic-bezier(.88,.02,.92,.66),
  1553.                     border-color .25s ease-in-out;
  1554.       }
  1555.       `,
  1556.  
  1557.       `
  1558.       :host {
  1559.         box-sizing: content-box;
  1560.         width: ${WIDTH}px;
  1561.         min-height: ${MIN_HEIGHT}px;
  1562.         position: fixed;
  1563.         right: 0;
  1564.         bottom: 0;
  1565.         padding: 0;
  1566.         margin: 0;
  1567.         background: white;
  1568.         box-shadow: 0 0 100px rgba(0,0,0,0.5);
  1569.         z-index: 999999;
  1570.         border-width: ${TOP_BORDER}px ${BORDER}px ${BORDER}px;
  1571.         border-style: solid;
  1572.       }
  1573.       :host(:not([style*="opacity: 1"])) {
  1574.         pointer-events: none;
  1575.       }
  1576.       :host([\\type$="question"].\\hasAnswerShelf) {
  1577.         border-image: linear-gradient(
  1578.           ${colors.question.back} 66%,
  1579.           ${colors.answer.back}) 1 1;
  1580.       }
  1581.       `.replace(/;/g, IMPORTANT),
  1582.  
  1583.       ...Object.entries(colors).map(([type, colors]) => `
  1584.         :host([\\type$="${type}"]) {
  1585.           border-color: ${colors.back} !important;
  1586.         }
  1587.       `),
  1588.  
  1589.       `
  1590.       #\\body {
  1591.         min-width: unset!important;
  1592.         box-shadow: none!important;
  1593.         padding: 0!important;
  1594.         margin: 0!important;
  1595.         background: ${colors.body.back}!important;
  1596.         color: ${colors.body.fore}!important;
  1597.         display: flex;
  1598.         flex-direction: column;
  1599.         height: 100%;
  1600.       }
  1601.  
  1602.       #\\title {
  1603.         all: unset;
  1604.         display: block;
  1605.         padding: 12px ${PADDING}px;
  1606.         font-weight: bold;
  1607.         font-size: 18px;
  1608.         line-height: 1.2;
  1609.         cursor: pointer;
  1610.       }
  1611.       #\\title:hover {
  1612.         text-decoration: underline;
  1613.         text-decoration-skip: ink;
  1614.       }
  1615.       #\\title:hover + #\\meta {
  1616.         opacity: 1.0;
  1617.       }
  1618.  
  1619.       #\\meta {
  1620.         position: absolute;
  1621.         font: bold 14px/${TOP_BORDER}px sans-serif;
  1622.         height: ${TOP_BORDER}px;
  1623.         top: -${TOP_BORDER}px;
  1624.         left: -${BORDER}px;
  1625.         right: ${BORDER * 2}px;
  1626.         padding: 0 0 0 ${BORDER + PADDING}px;
  1627.         display: flex;
  1628.         align-items: center;
  1629.         cursor: s-resize;
  1630.       }
  1631.       #\\meta b {
  1632.         height: ${TOP_BORDER}px;
  1633.         display: inline-block;
  1634.         padding: 0 6px;
  1635.         margin-left: -6px;
  1636.         margin-right: 3px;
  1637.       }
  1638.  
  1639.       #\\close {
  1640.         position: absolute;
  1641.         top: -${TOP_BORDER}px;
  1642.         right: -${BORDER}px;
  1643.         width: ${BORDER * 3}px;
  1644.         flex: none;
  1645.         cursor: pointer;
  1646.         padding: .5ex 1ex;
  1647.         font: normal 15px/1.0 sans-serif;
  1648.         color: #fff8;
  1649.       }
  1650.       #\\close:after {
  1651.         content: "x";
  1652.       }
  1653.       #\\close:active {
  1654.         background-color: rgba(0,0,0,.2);
  1655.       }
  1656.       #\\close:hover {
  1657.         background-color: rgba(0,0,0,.1);
  1658.       }
  1659.  
  1660.       #\\parts {
  1661.         position: relative;
  1662.         overflow-y: overlay; /* will replace with scrollbar-gutter once it's implemented */
  1663.         overflow-x: hidden;
  1664.         flex-grow: 2;
  1665.         outline: none;
  1666.         margin: 0;
  1667.         padding: ${PADDING}px ${PADDING - PROSE_MARGIN}px ${PADDING}px ${PADDING}px !important;
  1668.       }
  1669.       #\\parts > .question-status {
  1670.         margin: -${PADDING}px -${PADDING}px ${PADDING}px;
  1671.         padding-left: ${PADDING}px;
  1672.       }
  1673.       #\\parts .question-originals-of-duplicate {
  1674.         margin: -${PADDING}px -${PADDING}px ${PADDING}px;
  1675.         padding: ${PADDING / 2 >> 0}px ${PADDING}px;
  1676.       }
  1677.       #\\parts > .question-status h2 {
  1678.         font-weight: normal;
  1679.       }
  1680.       #\\parts a.SEpreviewable {
  1681.         text-decoration: underline !important;
  1682.         text-decoration-skip: ink;
  1683.       }
  1684.  
  1685.       #\\parts .js-follow-up .fd-column {
  1686.         flex-flow: row-reverse !important;
  1687.         justify-content: flex-end;
  1688.       }
  1689.       #\\parts li.comment > :first-child,
  1690.       #\\parts .js-follow-up .fd-column > :last-child {
  1691.         font-weight: bold;
  1692.         flex: 0 0 2em;
  1693.       }
  1694.       #\\parts li.comment {
  1695.         display: flex;
  1696.       }
  1697.       #\\parts li.comment:nth-last-child(n + 2) {
  1698.         margin-bottom: 1em;
  1699.       }
  1700.       #\\parts .delete-tag {
  1701.         display: none;
  1702.       }
  1703.       #\\parts .new-comment-highlight .comment-text {
  1704.         -webkit-animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  1705.         -moz-animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  1706.         animation: highlight 9s cubic-bezier(0,.8,.37,.88);
  1707.       }
  1708.       #\\parts .post-menu > span {
  1709.         opacity: .35;
  1710.       }
  1711.  
  1712.       #\\parts #user-menu {
  1713.         position: absolute;
  1714.       }
  1715.       .\\userCard {
  1716.         position: absolute;
  1717.         display: none;
  1718.         transition: opacity .25s cubic-bezier(.88,.02,.92,.66) .5s;
  1719.         margin-top: -3rem;
  1720.       }
  1721.       #\\parts .wmd-preview a:not(.post-tag),
  1722.       #\\parts .postcell a:not(.post-tag),
  1723.       #\\parts .comment-copy a:not(.post-tag) {
  1724.         border-bottom: none;
  1725.       }
  1726.  
  1727.       #\\answers-title {
  1728.         margin: .5ex 1ex 0 0;
  1729.         font-size: 18px;
  1730.         line-height: 1.0;
  1731.         float: left;
  1732.       }
  1733.       #\\answers-title p {
  1734.         font-size: 11px;
  1735.         font-weight: normal;
  1736.         max-width: 8em;
  1737.         line-height: 1.0;
  1738.         margin: 1ex 0 0 0;
  1739.         padding: 0;
  1740.       }
  1741.       #\\answers-title b,
  1742.       #\\answers-title label {
  1743.         background: linear-gradient(#fff8 30%, #fff);
  1744.         width: 10px;
  1745.         height: 10px;
  1746.         padding: 2px;
  1747.         margin-right: 2px;
  1748.         box-shadow: 0 1px 3px #0008;
  1749.         border-radius: 3px;
  1750.         font-weight: normal;
  1751.         display: inline-block;
  1752.         vertical-align: middle;
  1753.       }
  1754.       #\\answers-title b::after {
  1755.         content: "";
  1756.         display: block;
  1757.         width: 100%;
  1758.         height: 100%;
  1759.         background: url('data:image/svg+xml;base64,${SVG_ARROW}') no-repeat center;
  1760.       }
  1761.       #\\answers-title b[mirrored]::after {
  1762.         transform: scaleX(-1);
  1763.       }
  1764.       #\\answers-title label {
  1765.         width: auto;
  1766.         color: ${KBD_COLOR};
  1767.       }
  1768.  
  1769.       #\\answers {
  1770.         all: unset;
  1771.         display: block;
  1772.         padding: 10px 10px 10px ${PADDING}px;
  1773.         font-weight: bold;
  1774.         line-height: 1.0;
  1775.         border-top: 4px solid ${colors.answer.back}5e;
  1776.         background-color: ${colors.answer.back}5e;
  1777.         color: ${colors.answer.fore};
  1778.         word-break: break-word;
  1779.       }
  1780.       #\\answers a {
  1781.         color: ${colors.answer.fore};
  1782.         text-decoration: none;
  1783.         font-size: 11px;
  1784.         font-family: monospace;
  1785.         width: 32px !important;
  1786.         display: inline-block;
  1787.         position: relative;
  1788.         vertical-align: top;
  1789.         margin: 0 1ex 1ex 0;
  1790.         padding: 0 0 1.1ex 0;
  1791.       }
  1792.       [\\type*="deleted"] #\\answers a {
  1793.         color: ${colors.deleted.fore};
  1794.       }
  1795.       #\\answers img {
  1796.         width: 32px;
  1797.         height: 32px;
  1798.       }
  1799.       #\\answers a.deleted-answer {
  1800.         color: ${colors.deleted.fore};
  1801.         background: transparent;
  1802.         opacity: 0.25;
  1803.       }
  1804.       #\\answers a.deleted-answer:hover {
  1805.         opacity: 1.0;
  1806.       }
  1807.       #\\answers a:hover:not(.SEpreviewed) {
  1808.         text-decoration: underline;
  1809.         text-decoration-skip: ink;
  1810.       }
  1811.       #\\answers a.SEpreviewed {
  1812.         background-color: ${colors.answer.fore};
  1813.         color: ${colors.answer.foreInv};
  1814.         outline: 4px solid ${colors.answer.fore};
  1815.       }
  1816.       #\\answers a::after {
  1817.         white-space: nowrap;
  1818.         overflow: hidden;
  1819.         text-overflow: ellipsis;
  1820.         max-width: 40px;
  1821.         position: absolute;
  1822.         content: attr(title);
  1823.         top: 44px;
  1824.         left: 0;
  1825.         font: normal .75rem/1.0 sans-serif;
  1826.         opacity: .7;
  1827.       }
  1828.       #\\answers a:only-child::after {
  1829.         max-width: calc(${WIDTH}px - 10em);
  1830.       }
  1831.       #\\answers a:hover::after {
  1832.         opacity: 1;
  1833.       }
  1834.       .\\accepted::before {
  1835.         content: "✔";
  1836.         position: absolute;
  1837.         display: block;
  1838.         top: 1.3ex;
  1839.         right: -0.7ex;
  1840.         font-size: 32px;
  1841.         color: #4bff2c;
  1842.         text-shadow: 1px 2px 2px rgba(0,0,0,0.5);
  1843.       }
  1844.  
  1845.       @-webkit-keyframes highlight {
  1846.         from {background: #ffcf78}
  1847.         to   {background: none}
  1848.       }
  1849.       `,
  1850.  
  1851.       ...Object.keys(colors).map(s => `
  1852.         #\\title {
  1853.           background-color: ${colors[s].back}5e;
  1854.           color: ${colors[s].fore};
  1855.         }
  1856.         #\\meta {
  1857.           color: ${colors[s].fore};
  1858.         }
  1859.         #\\meta b {
  1860.           color: ${colors[s].foreInv};
  1861.           background: ${colors[s].fore};
  1862.         }
  1863.         #\\close {
  1864.           color: ${colors[s].fore};
  1865.         }
  1866.         #\\parts::-webkit-scrollbar {
  1867.           background-color: ${colors[s].back}19;
  1868.         }
  1869.         #\\parts::-webkit-scrollbar-thumb {
  1870.           background-color: ${colors[s].back}32;
  1871.         }
  1872.         #\\parts::-webkit-scrollbar-thumb:hover {
  1873.           background-color: ${colors[s].back}4b;
  1874.         }
  1875.         #\\parts::-webkit-scrollbar-thumb:active {
  1876.           background-color: ${colors[s].back}c0;
  1877.         }
  1878.       `
  1879.       // language=JS
  1880.         .replace(/#\\/g, `[\\type$="${s}"] $&`)
  1881.       ),
  1882.  
  1883.       ...['deleted', 'closed'].map(s => /* language=CSS */ `
  1884.         #\\answers {
  1885.           border-top-color: ${colors[s].back}5e;
  1886.           background-color: ${colors[s].back}5e;
  1887.           color: ${colors[s].fore};
  1888.         }
  1889.         #\\answers a.SEpreviewed {
  1890.           background-color: ${colors[s].fore};
  1891.           color: ${colors[s].foreInv};
  1892.         }
  1893.         #\\answers a.SEpreviewed:after {
  1894.           border-color: ${colors[s].fore};
  1895.         }
  1896.       `
  1897.       // language=JS
  1898.         .replace(/#\\/g, `[\\type$="${s}"] $&`)
  1899.       ),
  1900.  
  1901.       GM_getResourceText(`HL-style${isDark ? '-dark' : ''}`),
  1902.     ].join('\n').replace(/\\/g, `${ID}-`);
  1903.   }
  1904.  
  1905.   static applyRemScale(id, css) {
  1906.     const el = pv.styles.get(id);
  1907.     if (pv.remScale && pv.remScale !== 1 && !pv.stylesScaled.has(id)) {
  1908.       css = (css || el.textContent).replace(/([:\s])((?:\d*\.?)?\d+)(?=rem([;}\s]|\/\*))/gi,
  1909.         (_, prev, size) => prev + (pv.remScale * size));
  1910.       pv.stylesScaled.add(id);
  1911.     }
  1912.     el.textContent = css;
  1913.   }
  1914. }
  1915.  
  1916. function $(selector, node = pv.shadow) {
  1917.   return node && node.querySelector(selector);
  1918. }
  1919.  
  1920. Object.assign($, {
  1921.  
  1922.   all(selector, node = pv.shadow) {
  1923.     return node ? [...node.querySelectorAll(selector)] : [];
  1924.   },
  1925.  
  1926.   on(eventName, node, fn, options) {
  1927.     return node.addEventListener(eventName, fn, options);
  1928.   },
  1929.  
  1930.   off(eventName, node, fn, options) {
  1931.     return node.removeEventListener(eventName, fn, options);
  1932.   },
  1933.  
  1934.   remove(selector, node = pv.shadow) {
  1935.     for (const el of node.querySelectorAll(selector))
  1936.       el.remove();
  1937.   },
  1938.  
  1939.   text(selector, node = pv.shadow) {
  1940.     const el = typeof selector === 'string' ?
  1941.       node && node.querySelector(selector) :
  1942.       selector;
  1943.     return el ? el.textContent.trim() : '';
  1944.   },
  1945.  
  1946.   create(
  1947.     selector,
  1948.     opts = {},
  1949.     children = opts.children ||
  1950.                (typeof opts !== 'object' || Util.isIterable(opts)) && opts
  1951.   ) {
  1952.     const EOL = selector.length;
  1953.     const idStart = (selector.indexOf('#') + 1 || EOL + 1) - 1;
  1954.     const clsStart = (selector.indexOf('.', idStart < EOL ? idStart : 0) + 1 || EOL + 1) - 1;
  1955.     const tagEnd = Math.min(idStart, clsStart);
  1956.     const tag = (tagEnd < EOL ? selector.slice(0, tagEnd) : selector) || opts.tag || 'div';
  1957.     const id = idStart < EOL && selector.slice(idStart + 1, clsStart) || opts.id || '';
  1958.     const cls = clsStart < EOL && selector.slice(clsStart + 1).replace(/\./g, ' ') ||
  1959.                 opts.className ||
  1960.                 '';
  1961.     const el = id && pv.shadow && pv.shadow.getElementById(id) ||
  1962.                document.createElement(tag);
  1963.     if (el.id !== id)
  1964.       el.id = id;
  1965.     if (el.className !== cls)
  1966.       el.className = cls;
  1967.     const hasOwnProperty = Object.hasOwnProperty;
  1968.     for (const key in opts) {
  1969.       if (!hasOwnProperty.call(opts, key))
  1970.         continue;
  1971.       const value = opts[key];
  1972.       switch (key) {
  1973.         case 'tag':
  1974.         case 'id':
  1975.         case 'className':
  1976.         case 'children':
  1977.           break;
  1978.         case 'dataset': {
  1979.           const dataset = el.dataset;
  1980.           for (const k in value) {
  1981.             if (hasOwnProperty.call(value, k)) {
  1982.               const v = value[k];
  1983.               if (dataset[k] !== v)
  1984.                 dataset[k] = v;
  1985.             }
  1986.           }
  1987.           break;
  1988.         }
  1989.         case 'attributes': {
  1990.           for (const k in value) {
  1991.             if (hasOwnProperty.call(value, k)) {
  1992.               const v = value[k];
  1993.               if (el.getAttribute(k) !== v)
  1994.                 el.setAttribute(k, v);
  1995.             }
  1996.           }
  1997.           break;
  1998.         }
  1999.         default:
  2000.           if (el[key] !== value)
  2001.             el[key] = value;
  2002.       }
  2003.     }
  2004.     if (children) {
  2005.       if (!hasOwnProperty.call(opts, 'textContent'))
  2006.         el.textContent = '';
  2007.       el.append(...Array.isArray(children) ? children.filter(Boolean)
  2008.         : Util.isIterable(children) ? children
  2009.           : [children]);
  2010.     }
  2011.     let before, after, parent;
  2012.     if ((before = opts.before) && before !== el.nextSibling && before !== el)
  2013.       before.insertAdjacentElement('beforebegin', el);
  2014.     else if ((after = opts.after) && after !== el.previousSibling && after !== el)
  2015.       after.insertAdjacentElement('afterend', el);
  2016.     else if ((parent = opts.parent) && parent !== el.parentNode)
  2017.       parent.appendChild(el);
  2018.     return el;
  2019.   },
  2020.  
  2021.   setStyle(el, ...props) {
  2022.     const style = el.style;
  2023.     const s0 = style.cssText;
  2024.     let s = s0;
  2025.  
  2026.     for (const p of props) {
  2027.       if (!p)
  2028.         continue;
  2029.  
  2030.       const [name, value, important = true] = p;
  2031.       const rValue = value + (important && value ? ' !important' : '');
  2032.       const rx = new RegExp(`(^|[\\s;])${name}(\\s*:\\s*)([^;]*?)(\\s*(?:;|$))`, 'i');
  2033.       const m = rx.exec(s);
  2034.  
  2035.       if (!m && value) {
  2036.         const rule = name + ': ' + rValue;
  2037.         s += !s || s.endsWith(';') ? rule : '; ' + rule;
  2038.         continue;
  2039.       }
  2040.  
  2041.       if (!m && !value)
  2042.         continue;
  2043.  
  2044.       const [, sep1, sep2, oldValue, sep3] = m;
  2045.       if (value !== oldValue) {
  2046.         s = s.slice(0, m.index) +
  2047.             sep1 + (rValue ? name + sep2 + rValue + sep3 : '') +
  2048.             s.slice(m.index + m[0].length);
  2049.       }
  2050.     }
  2051.  
  2052.     if (s !== s0)
  2053.       style.cssText = s;
  2054.   },
  2055. });

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