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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Accessibility Support
What to expect of screen readers and voice control apps.
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.
Coming in your browsers
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Firefox platform status
Implementation & standardization roadmap for web platform features.
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Edge platform status
View the status of web platform features in Edge Chromium and EdgeHTML.
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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.