Can I Use
Browser features support tables.
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Can I Stop
Browser usage by region.
Accessibility
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Who Can Use
Colors combinations accessibility.
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PowerMapper Tests
Test results for assistive technologies.
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Accessibility Support
What to expect of screen readers and voice control apps.
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HTML5 Accessibility
Accessibility support status of HTML5 features across major browsers.
Features
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MDN
Resources for developers, by developers.
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cssdb
A database of staged (future) CSS features.
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Is Houdini Ready Yet?
Houdini APIs support in different browsers.
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Web Platform Tests Dashboard
Results for the WPT, which are a group of test suites for many web platform specifications.
Coming in your browsers
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Webkit status
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Chrome status
Emails
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Can I email
Support tables for HTML and CSS in emails.