(function () { try { var ua = String(navigator.userAgent || ''); if (ua.indexOf('CriOS/') === -1 || !/iPhone|iPad|iPod/.test(ua)) return; var KEY = 'crios-inset-guard'; var perf = window.performance; var t0 = perf && perf.now ? perf.now() : Date.now(); function now() { var n = perf && perf.now ? perf.now() : Date.now(); return Math.round((n - t0) * 10) / 10; } function num(v) { return typeof v === 'number' && isFinite(v) ? Math.round(v * 10) / 10 : null; } function curY() { try { var y = window.scrollY; if (typeof y !== 'number') y = window.pageYOffset; return num(y); } catch (e) { return null; } } function ih() { try { return num(window.innerHeight); } catch (e) { return null; } } function ch() { try { return num(document.documentElement.clientHeight); } catch (e) { return null; } } // Screen height along the current orientation: the innerHeight Chrome reports // when its insets are exactly zero. iOS reports screen.width/height in portrait // terms whatever the orientation. function fullHeight() { try { var w = screen.width, h = screen.height, landscape = false; try { landscape = !!(screen.orientation && /landscape/.test(String(screen.orientation.type))); } catch (e) {} if (!landscape) { try { landscape = Math.abs(Number(window.orientation)) === 90; } catch (e) {} } return landscape ? Math.min(w, h) : Math.max(w, h); } catch (e) { return null; } } var navType = 'unknown'; try { var entries = perf.getEntriesByType ? perf.getEntriesByType('navigation') : null; if (entries && entries.length && entries[0].type) navType = entries[0].type; else if (perf.navigation) navType = ['navigate', 'reload', 'back_forward'][perf.navigation.type] || String(perf.navigation.type); } catch (e) {} // The records earlier documents in this tab left behind, one per path (see // save()), so a Back through another page still finds this page's record. var here = '/'; try { here = String(location.pathname || '/'); } catch (e) {} function readMap() { try { var raw = sessionStorage.getItem(KEY); var m = raw ? JSON.parse(raw) : null; return m && typeof m === 'object' ? m : {}; } catch (e) { return {}; } } var prev = null; try { var entry = readMap()[here]; if (entry && typeof entry === 'object') prev = entry; } catch (e) {} var hasHash = false; try { hasHash = !!location.hash; } catch (e) {} var ih0 = ih(), ch0 = ch(), full = fullHeight(); var log = []; window.__criosGuard = { prev: prev, navType: navType, log: log }; function record(kind, fields) { var e = { kind: kind, tg: now() }; try { for (var k in fields) if (Object.prototype.hasOwnProperty.call(fields, k)) e[k] = fields[k]; } catch (err) {} log.push(e); try { var dbg = window.__scrolldbg; if (dbg && typeof dbg.note === 'function') dbg.note('mitigation', e); } catch (err) {} return e; } function on(target, name, fn) { try { target.addEventListener(name, function (ev) { try { fn(ev); } catch (e) {} }, { capture: true, passive: true }); } catch (e) { try { target.addEventListener(name, fn, true); } catch (e2) {} } } // ---- reader input and reader-driven scrolling ---- // A touch scroll is always preceded by touchstart (and pointerdown); trackpad // and keyboard scrolling by wheel and keydown; a focus move by focusin. The // guard never acts after any of these. var input = null; var touching = false, lastTouchEnd = -1e9, lastInputAt = -1e9; var userScrolled = false; function onInput(ev) { if (!input) input = { type: ev.type, t: now() }; lastInputAt = now(); if (ev.type === 'touchstart') touching = true; } on(window, 'pointerdown', onInput); on(window, 'touchstart', onInput); on(window, 'wheel', onInput); on(window, 'keydown', onInput); on(window, 'focusin', onInput); on(window, 'touchend', function () { touching = false; lastTouchEnd = now(); }); on(window, 'touchcancel', function () { touching = false; lastTouchEnd = now(); }); on(window, 'scroll', function () { if (touching || now() - lastInputAt < 1500 || now() - lastTouchEnd < 1500) userScrolled = true; }); // ---- 1. covered state: innerHeight grows to the screen height with no scroll and no input ---- // The baseline is the smallest innerHeight seen so far, not the value at t0: // before the viewport meta applies WebKit reports a desktop-sized viewport. var covered = null, ihMin = null; function checkCovered(src) { if (covered || input) return; var h = ih(), y = curY(), f = fullHeight(); if (f === null || h === null || y === null) return; if (h <= f + 2 && (ihMin === null || h < ihMin)) ihMin = h; if (h >= f - 2 && h <= f + 2 && y < 1 && ihMin !== null && h - ihMin >= 40) { covered = record('covered', { action: 'none', src: src, ihMin: ihMin, ih: h, ch: ch(), full: f, y: y, reason: 'scrollY is already 0: the offset is the native content inset, outside the page' }); } } checkCovered('init'); on(window, 'resize', function () { checkCovered('resize'); }); try { if (window.visualViewport) on(window.visualViewport, 'resize', function () { checkCovered('vv.resize'); }); } catch (e) {} try { var coverPoll = setInterval(function () { try { if (covered || input || now() > 8000) { clearInterval(coverPoll); return; } checkCovered('poll'); } catch (e) {} }, 100); } catch (e) {} // ---- 2. restoration guard ---- var restoring = navType === 'reload' || navType === 'back_forward'; var samePage = !!(prev && prev.u === here); var prevAtTop = !!(prev && typeof prev.y === 'number' && prev.y <= 8); var prevCoveredUnscrolled = !!(prev && prev.cov === 1 && prev.us !== 1); var armed = restoring && !hasHash && samePage && (prevAtTop || prevCoveredUnscrolled); // The bug lands the page exactly one top-toolbar height down, which is less // than the total toolbar height Chrome holds out of the layout viewport // (screen height minus clientHeight). Measured at check time, once the // viewport meta has applied; a nonsensical band falls back to 240px. function toolbarBand() { var f = fullHeight(), c = ch(); if (f === null || c === null || c <= 0 || f - c < 40) return null; return num(f - c); } var lower = 16; function upperBound(band) { return band !== null ? band + 24 : 240; } var corrections = 0, guardDone = !armed; record('arm', { armed: armed, navType: navType, samePage: samePage, hash: hasHash, prevY: prev ? prev.y : null, prevCovered: prev ? prev.cov : null, prevUserScrolled: prev ? prev.us : null, prevIh: prev ? prev.ih : null, band: toolbarBand(), ih0: ih0, ch0: ch0, full: full }); function checkRestore(src) { if (guardDone) return; if (input) { guardDone = true; record('disarm', { reason: 'input', type: input.type, y: curY() }); return; } if (now() > 6000) { guardDone = true; return; } var y = curY(); if (y === null || y <= lower) return; var band = toolbarBand(), upper = upperBound(band); if (y > upper) { guardDone = true; record('restore', { action: 'none', reason: 'outside toolbar band', src: src, y: y, band: band, upper: upper }); return; } corrections++; var before = y; window.scrollTo(0, 0); var after = curY(); record('restore', { action: 'scrollTo(0,0)', src: src, from: before, after: after, n: corrections, band: band, upper: upper, prevY: prev.y, prevCovered: prev.cov, prevUserScrolled: prev.us, navType: navType, ih: ih(), ch: ch() }); // WebKit may try the restore twice (first layout and load completion). if (corrections >= 2) guardDone = true; } on(window, 'scroll', function () { checkRestore('scroll'); }); try { var restorePoll = setInterval(function () { try { if (guardDone || now() > 6000) { clearInterval(restorePoll); return; } checkRestore('tick'); } catch (e) {} }, 32); } catch (e) {} // ---- the record for the next document of this path in this tab ---- function save() { try { var path = String(location.pathname || '/'); var map = readMap(); map[path] = { u: path, y: curY(), ih: ih(), ch: ch(), full: full, cov: covered ? 1 : 0, inp: input ? 1 : 0, us: userScrolled ? 1 : 0, nav: navType, t: Date.now() }; // Keep the 20 most recent paths. var keys = []; for (var k in map) if (Object.prototype.hasOwnProperty.call(map, k)) keys.push(k); if (keys.length > 20) { keys.sort(function (a, b) { return (map[b].t || 0) - (map[a].t || 0); }); for (var i = 20; i < keys.length; i++) delete map[keys[i]]; } sessionStorage.setItem(KEY, JSON.stringify(map)); } catch (e) {} } on(window, 'pagehide', save); on(window, 'visibilitychange', function () { if (document.visibilityState === 'hidden') save(); }); } catch (e) {} })();

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