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The Accessibility Tree: A Training Guide for Advanced Web Development

The purpose of the ARIA spec is to map simulated web controls to equivalent control types on the platform Accessibility API, and to provide various mechanisms to enhance the accessibility of web technologies.

Operating System vendors, browser vendors, and Assistive Technology vendors, then follow the ARIA spec to ensure that control mappings are supported properly in each.

It's important to understand that all ARIA Roles and supporting States and Properties map to their equivalent Roles, States and Properties within the Accessibility API on that Operating System, which is why the same ARIA markup when correctly implemented is valid across all devices and platforms.

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

(Written in collaboration with members of the W3C PFWG, including Richard Schwerdtfeger, T.V Raman, and Mark Sadecki)

Distributed under the terms of the Open Source Initiative OSI - MIT License.

Developed and maintained by: Bryan Garaventa https://www.linkedin.com/in/bgaraventa Or on Twitter at https://twitter.com/bryanegaraventa

Note: All visual design by Angela Ricci (web designer and web front-end developer). You can check her work at her personal site https://gericci.me/ Or you can follow her on Twitter at https://twitter.com/gericci

Project home:

https://whatsock.com/training

Related projects:

About

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

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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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The Accessibility Tree: A Training Guide for Advanced Web Development

The purpose of the ARIA spec is to map simulated web controls to equivalent control types on the platform Accessibility API, and to provide various mechanisms to enhance the accessibility of web technologies.

Operating System vendors, browser vendors, and Assistive Technology vendors, then follow the ARIA spec to ensure that control mappings are supported properly in each.

It's important to understand that all ARIA Roles and supporting States and Properties map to their equivalent Roles, States and Properties within the Accessibility API on that Operating System, which is why the same ARIA markup when correctly implemented is valid across all devices and platforms.

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

(Written in collaboration with members of the W3C PFWG, including Richard Schwerdtfeger, T.V Raman, and Mark Sadecki)

Distributed under the terms of the Open Source Initiative OSI - MIT License.

Developed and maintained by: Bryan Garaventa https://www.linkedin.com/in/bgaraventa Or on Twitter at https://twitter.com/bryanegaraventa

Note: All visual design by Angela Ricci (web designer and web front-end developer). You can check her work at her personal site https://gericci.me/ Or you can follow her on Twitter at https://twitter.com/gericci

Project home:

https://whatsock.com/training

Related projects:

About

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

Resources

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, '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('^' + ".*" + '
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The Accessibility Tree: A Training Guide for Advanced Web Development

The purpose of the ARIA spec is to map simulated web controls to equivalent control types on the platform Accessibility API, and to provide various mechanisms to enhance the accessibility of web technologies.

Operating System vendors, browser vendors, and Assistive Technology vendors, then follow the ARIA spec to ensure that control mappings are supported properly in each.

It's important to understand that all ARIA Roles and supporting States and Properties map to their equivalent Roles, States and Properties within the Accessibility API on that Operating System, which is why the same ARIA markup when correctly implemented is valid across all devices and platforms.

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

(Written in collaboration with members of the W3C PFWG, including Richard Schwerdtfeger, T.V Raman, and Mark Sadecki)

Distributed under the terms of the Open Source Initiative OSI - MIT License.

Developed and maintained by: Bryan Garaventa https://www.linkedin.com/in/bgaraventa Or on Twitter at https://twitter.com/bryanegaraventa

Note: All visual design by Angela Ricci (web designer and web front-end developer). You can check her work at her personal site https://gericci.me/ Or you can follow her on Twitter at https://twitter.com/gericci

Project home:

https://whatsock.com/training

Related projects:

About

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

Resources

Stars

7 stars

Watchers

1 watching

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Packages

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, '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('^' + ".*" + '
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Repository files navigation

The Accessibility Tree: A Training Guide for Advanced Web Development

The purpose of the ARIA spec is to map simulated web controls to equivalent control types on the platform Accessibility API, and to provide various mechanisms to enhance the accessibility of web technologies.

Operating System vendors, browser vendors, and Assistive Technology vendors, then follow the ARIA spec to ensure that control mappings are supported properly in each.

It's important to understand that all ARIA Roles and supporting States and Properties map to their equivalent Roles, States and Properties within the Accessibility API on that Operating System, which is why the same ARIA markup when correctly implemented is valid across all devices and platforms.

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

(Written in collaboration with members of the W3C PFWG, including Richard Schwerdtfeger, T.V Raman, and Mark Sadecki)

Distributed under the terms of the Open Source Initiative OSI - MIT License.

Developed and maintained by: Bryan Garaventa https://www.linkedin.com/in/bgaraventa Or on Twitter at https://twitter.com/bryanegaraventa

Note: All visual design by Angela Ricci (web designer and web front-end developer). You can check her work at her personal site https://gericci.me/ Or you can follow her on Twitter at https://twitter.com/gericci

Project home:

https://whatsock.com/training

Related projects:

About

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

Resources

Stars

7 stars

Watchers

1 watching

Forks

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Packages

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

Repository files navigation

The Accessibility Tree: A Training Guide for Advanced Web Development

The purpose of the ARIA spec is to map simulated web controls to equivalent control types on the platform Accessibility API, and to provide various mechanisms to enhance the accessibility of web technologies.

Operating System vendors, browser vendors, and Assistive Technology vendors, then follow the ARIA spec to ensure that control mappings are supported properly in each.

It's important to understand that all ARIA Roles and supporting States and Properties map to their equivalent Roles, States and Properties within the Accessibility API on that Operating System, which is why the same ARIA markup when correctly implemented is valid across all devices and platforms.

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

(Written in collaboration with members of the W3C PFWG, including Richard Schwerdtfeger, T.V Raman, and Mark Sadecki)

Distributed under the terms of the Open Source Initiative OSI - MIT License.

Developed and maintained by: Bryan Garaventa https://www.linkedin.com/in/bgaraventa Or on Twitter at https://twitter.com/bryanegaraventa

Note: All visual design by Angela Ricci (web designer and web front-end developer). You can check her work at her personal site https://gericci.me/ Or you can follow her on Twitter at https://twitter.com/gericci

Project home:

https://whatsock.com/training

Related projects:

About

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

Resources

Stars

7 stars

Watchers

1 watching

Forks

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Packages

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

Repository files navigation

The Accessibility Tree: A Training Guide for Advanced Web Development

The purpose of the ARIA spec is to map simulated web controls to equivalent control types on the platform Accessibility API, and to provide various mechanisms to enhance the accessibility of web technologies.

Operating System vendors, browser vendors, and Assistive Technology vendors, then follow the ARIA spec to ensure that control mappings are supported properly in each.

It's important to understand that all ARIA Roles and supporting States and Properties map to their equivalent Roles, States and Properties within the Accessibility API on that Operating System, which is why the same ARIA markup when correctly implemented is valid across all devices and platforms.

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

(Written in collaboration with members of the W3C PFWG, including Richard Schwerdtfeger, T.V Raman, and Mark Sadecki)

Distributed under the terms of the Open Source Initiative OSI - MIT License.

Developed and maintained by: Bryan Garaventa https://www.linkedin.com/in/bgaraventa Or on Twitter at https://twitter.com/bryanegaraventa

Note: All visual design by Angela Ricci (web designer and web front-end developer). You can check her work at her personal site https://gericci.me/ Or you can follow her on Twitter at https://twitter.com/gericci

Project home:

https://whatsock.com/training

Related projects:

About

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

Resources

Stars

7 stars

Watchers

1 watching

Forks

Releases

Packages

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('^' + ".*" + '
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The Accessibility Tree: A Training Guide for Advanced Web Development

The purpose of the ARIA spec is to map simulated web controls to equivalent control types on the platform Accessibility API, and to provide various mechanisms to enhance the accessibility of web technologies.

Operating System vendors, browser vendors, and Assistive Technology vendors, then follow the ARIA spec to ensure that control mappings are supported properly in each.

It's important to understand that all ARIA Roles and supporting States and Properties map to their equivalent Roles, States and Properties within the Accessibility API on that Operating System, which is why the same ARIA markup when correctly implemented is valid across all devices and platforms.

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

(Written in collaboration with members of the W3C PFWG, including Richard Schwerdtfeger, T.V Raman, and Mark Sadecki)

Distributed under the terms of the Open Source Initiative OSI - MIT License.

Developed and maintained by: Bryan Garaventa https://www.linkedin.com/in/bgaraventa Or on Twitter at https://twitter.com/bryanegaraventa

Note: All visual design by Angela Ricci (web designer and web front-end developer). You can check her work at her personal site https://gericci.me/ Or you can follow her on Twitter at https://twitter.com/gericci

Project home:

https://whatsock.com/training

Related projects:

About

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

Resources

Stars

7 stars

Watchers

1 watching

Forks

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Packages

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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); } })(); })();
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The Accessibility Tree: A Training Guide for Advanced Web Development

The purpose of the ARIA spec is to map simulated web controls to equivalent control types on the platform Accessibility API, and to provide various mechanisms to enhance the accessibility of web technologies.

Operating System vendors, browser vendors, and Assistive Technology vendors, then follow the ARIA spec to ensure that control mappings are supported properly in each.

It's important to understand that all ARIA Roles and supporting States and Properties map to their equivalent Roles, States and Properties within the Accessibility API on that Operating System, which is why the same ARIA markup when correctly implemented is valid across all devices and platforms.

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

(Written in collaboration with members of the W3C PFWG, including Richard Schwerdtfeger, T.V Raman, and Mark Sadecki)

Distributed under the terms of the Open Source Initiative OSI - MIT License.

Developed and maintained by: Bryan Garaventa https://www.linkedin.com/in/bgaraventa Or on Twitter at https://twitter.com/bryanegaraventa

Note: All visual design by Angela Ricci (web designer and web front-end developer). You can check her work at her personal site https://gericci.me/ Or you can follow her on Twitter at https://twitter.com/gericci

Project home:

https://whatsock.com/training

Related projects:

About

The Accessibility Tree Training Guide provides an in depth overview of all relevant information that is important to be aware of when building ARIA enhanced web technologies.

Resources

Stars

7 stars

Watchers

1 watching

Forks

Releases

Packages

Contributors

Languages