Modern & Resilient
CSS is designed to adapt to context – failing silently, and enhancing progressively. We have tools to manage that context and support everyone, without giving up on the latest features. The details may vary from project to project, but we’ll look at practical strategies for building an expressive and robust CSS system that works for you.

Browser engine release notes, issues, and features status
Gecko:
- Firefox Core Issues
- Firefox Experimental Features
- Firefox Release Notes
- Firefox Release Calendar
- Mozilla Standards Positions
WebKit:
Chromium/Blink:
CodePen Demos
Resources
- Features with 100% browser support are capped at 97.98%
- Browser usage table
- Baseline
- Adrian Roselli, Baseline Does Not Really Cover Baseline Support
- Mozilla Developer Network
- Web Platform Tests
- Ethan Marcotte, Responsive Web Design
- Natalie Downe, CSS Systems
- Brad Frost, support vs optimization
- Jeremy Keith, Resilient Web Design
- Jen Simmons, Intro to Resilient CSS
- Jen Simmons, Resilient Videos
- Dave Rupert, Getting started with View Transitions
- MDN, Support Queries
- MDN, Selector Queries
- MDN, Preference Queries
- Håkon Lie, Cascading HTML style sheets – a proposal (Oct 1994)
- Eric W Bailey, Accessibility preference settings, information architecture, and internalized ableism
- No Motion Isn’t Always
prefers-reduced-motion - W3C, Platform Design Principles