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Updated domain: html5test.co

This is a website for testing web standards in the browser. The HTML5 test score is an indication of how well your browser supports the HTML5 standard and related specifications. Find out which parts of HTML5 are supported by your browser today and compare the results with other browsers.

The HTML5 test does not try to test all of the new features offered by HTML5, nor does it try to test the functionality of each feature it does detect. Despite these shortcomings we hope that by quantifying the level of support users and web developers will get an idea of how hard the browser manufacturers work on improving their browsers and the web as a development platform. The score is calculated by testing for the many new features of HTML5. Each feature is worth one or more points. Apart from the main HTML5 specification and other specifications created the W3C HTML Working Group or WHATWG, this test also awards points for supporting related drafts and specifications. Please be aware that although the HTML5 specification is now an official recommendation, other specifications that are being tested are still in development and could change before receiving an official status. In the future new tests will be added for new specifications and existing tests will be updated when the specifications change.

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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BranchesTags
Repository files navigation
Updated domain: html5test.co
This is a website for testing web standards in the browser. The HTML5 test score is an indication
of how well your browser supports the HTML5 standard and related specifications. Find out which
parts of HTML5 are supported by your browser today and compare the results with other browsers.
The HTML5 test does not try to test all of the new features offered by HTML5, nor does it try to
test the functionality of each feature it does detect. Despite these shortcomings we hope that
by quantifying the level of support users and web developers will get an idea of how hard the browser
manufacturers work on improving their browsers and the web as a development platform.
The score is calculated by testing for the many new features of HTML5. Each feature is worth one or
more points. Apart from the main HTML5 specification and other specifications created the W3C HTML
Working Group or WHATWG, this test also awards points for supporting related drafts and specifications.
Please be aware that although the HTML5 specification is now an official recommendation, other
specifications that are being tested are still in development and could change before receiving
an official status. In the future new tests will be added for new specifications and existing
tests will be updated when the specifications change.
About
Updated HTML5 Test
html5test.co
Topics
browserhtml5html5testtest
Resources
Readme
MIT license
Activity
Stars
63 stars
Watchers
2 watching
Forks
14 forks
Report repository
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Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Updated domain: html5test.co
This is a website for testing web standards in the browser. The HTML5 test score is an indication
of how well your browser supports the HTML5 standard and related specifications. Find out which
parts of HTML5 are supported by your browser today and compare the results with other browsers.
The HTML5 test does not try to test all of the new features offered by HTML5, nor does it try to
test the functionality of each feature it does detect. Despite these shortcomings we hope that
by quantifying the level of support users and web developers will get an idea of how hard the browser
manufacturers work on improving their browsers and the web as a development platform.
The score is calculated by testing for the many new features of HTML5. Each feature is worth one or
more points. Apart from the main HTML5 specification and other specifications created the W3C HTML
Working Group or WHATWG, this test also awards points for supporting related drafts and specifications.
Please be aware that although the HTML5 specification is now an official recommendation, other
specifications that are being tested are still in development and could change before receiving
an official status. In the future new tests will be added for new specifications and existing
tests will be updated when the specifications change.
About
Updated HTML5 Test
html5test.co
Topics
browserhtml5html5testtest
Resources
Readme
MIT license
Activity
Stars
63 stars
Watchers
2 watching
Forks
14 forks
Report repository
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Updated domain: html5test.co
This is a website for testing web standards in the browser. The HTML5 test score is an indication
of how well your browser supports the HTML5 standard and related specifications. Find out which
parts of HTML5 are supported by your browser today and compare the results with other browsers.
The HTML5 test does not try to test all of the new features offered by HTML5, nor does it try to
test the functionality of each feature it does detect. Despite these shortcomings we hope that
by quantifying the level of support users and web developers will get an idea of how hard the browser
manufacturers work on improving their browsers and the web as a development platform.
The score is calculated by testing for the many new features of HTML5. Each feature is worth one or
more points. Apart from the main HTML5 specification and other specifications created the W3C HTML
Working Group or WHATWG, this test also awards points for supporting related drafts and specifications.
Please be aware that although the HTML5 specification is now an official recommendation, other
specifications that are being tested are still in development and could change before receiving
an official status. In the future new tests will be added for new specifications and existing
tests will be updated when the specifications change.
About
Updated HTML5 Test
html5test.co
Topics
browserhtml5html5testtest
Resources
Readme
MIT license
Activity
Stars
63 stars
Watchers
2 watching
Forks
14 forks
Report repository
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Updated domain: html5test.co
This is a website for testing web standards in the browser. The HTML5 test score is an indication
of how well your browser supports the HTML5 standard and related specifications. Find out which
parts of HTML5 are supported by your browser today and compare the results with other browsers.
The HTML5 test does not try to test all of the new features offered by HTML5, nor does it try to
test the functionality of each feature it does detect. Despite these shortcomings we hope that
by quantifying the level of support users and web developers will get an idea of how hard the browser
manufacturers work on improving their browsers and the web as a development platform.
The score is calculated by testing for the many new features of HTML5. Each feature is worth one or
more points. Apart from the main HTML5 specification and other specifications created the W3C HTML
Working Group or WHATWG, this test also awards points for supporting related drafts and specifications.
Please be aware that although the HTML5 specification is now an official recommendation, other
specifications that are being tested are still in development and could change before receiving
an official status. In the future new tests will be added for new specifications and existing
tests will be updated when the specifications change.
About
Updated HTML5 Test
html5test.co
Topics
browserhtml5html5testtest
Resources
Readme
MIT license
Activity
Stars
63 stars
Watchers
2 watching
Forks
14 forks
Report repository
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Updated domain: html5test.co
This is a website for testing web standards in the browser. The HTML5 test score is an indication
of how well your browser supports the HTML5 standard and related specifications. Find out which
parts of HTML5 are supported by your browser today and compare the results with other browsers.
The HTML5 test does not try to test all of the new features offered by HTML5, nor does it try to
test the functionality of each feature it does detect. Despite these shortcomings we hope that
by quantifying the level of support users and web developers will get an idea of how hard the browser
manufacturers work on improving their browsers and the web as a development platform.
The score is calculated by testing for the many new features of HTML5. Each feature is worth one or
more points. Apart from the main HTML5 specification and other specifications created the W3C HTML
Working Group or WHATWG, this test also awards points for supporting related drafts and specifications.
Please be aware that although the HTML5 specification is now an official recommendation, other
specifications that are being tested are still in development and could change before receiving
an official status. In the future new tests will be added for new specifications and existing
tests will be updated when the specifications change.
About
Updated HTML5 Test
html5test.co
Topics
browserhtml5html5testtest
Resources
Readme
MIT license
Activity
Stars
63 stars
Watchers
2 watching
Forks
14 forks
Report repository
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Updated domain: html5test.co
This is a website for testing web standards in the browser. The HTML5 test score is an indication
of how well your browser supports the HTML5 standard and related specifications. Find out which
parts of HTML5 are supported by your browser today and compare the results with other browsers.
The HTML5 test does not try to test all of the new features offered by HTML5, nor does it try to
test the functionality of each feature it does detect. Despite these shortcomings we hope that
by quantifying the level of support users and web developers will get an idea of how hard the browser
manufacturers work on improving their browsers and the web as a development platform.
The score is calculated by testing for the many new features of HTML5. Each feature is worth one or
more points. Apart from the main HTML5 specification and other specifications created the W3C HTML
Working Group or WHATWG, this test also awards points for supporting related drafts and specifications.
Please be aware that although the HTML5 specification is now an official recommendation, other
specifications that are being tested are still in development and could change before receiving
an official status. In the future new tests will be added for new specifications and existing
tests will be updated when the specifications change.
About
Updated HTML5 Test
html5test.co
Topics
browserhtml5html5testtest
Resources
Readme
MIT license
Activity
Stars
63 stars
Watchers
2 watching
Forks
14 forks
Report repository
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
BranchesTags
Repository files navigation
Updated domain: html5test.co
This is a website for testing web standards in the browser. The HTML5 test score is an indication
of how well your browser supports the HTML5 standard and related specifications. Find out which
parts of HTML5 are supported by your browser today and compare the results with other browsers.
The HTML5 test does not try to test all of the new features offered by HTML5, nor does it try to
test the functionality of each feature it does detect. Despite these shortcomings we hope that
by quantifying the level of support users and web developers will get an idea of how hard the browser
manufacturers work on improving their browsers and the web as a development platform.
The score is calculated by testing for the many new features of HTML5. Each feature is worth one or
more points. Apart from the main HTML5 specification and other specifications created the W3C HTML
Working Group or WHATWG, this test also awards points for supporting related drafts and specifications.
Please be aware that although the HTML5 specification is now an official recommendation, other
specifications that are being tested are still in development and could change before receiving
an official status. In the future new tests will be added for new specifications and existing
tests will be updated when the specifications change.
About
Updated HTML5 Test
html5test.co
Topics
browserhtml5html5testtest
Resources
Readme
MIT license
Activity
Stars
63 stars
Watchers
2 watching
Forks
14 forks
Report repository
Contributors
Languages