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