HTML and CSS News for March 2020

Browser updates

HTML & CSS-related updates for developers in Firefox 73
- Implemented overscroll-behavior-block and overscroll-behavior-inline, the logical mappings for overscroll-behavior-x and overscroll-behavior-y (bug 950799)
- The letter-spacing and word-spacing properties now work in SVG (bug 371787)
Firefox 73 is upon us
Safari Technology Preview 101 (and 100) released
- Added standard gamepad mapping for GameControllerGamepads Tightened up stylesheet loading
- Fixed EXIF orientation ignored for some CSS images
- Fixed elements no longer stay fixed with elastic overscroll
- Fixed :matches() to correctly combine with pseudo elements
- Fixed a leak of CSS Animations when removing its animation-name property
- Added standard gamepad mapping for GameControllerGamepads (not CSS related but I don't care)
- Tightened up stylesheet loading
- Fixed CSS rules with the same selector from several large stylesheets getting applied in the wrong order
- Fixed pages that trigger a redirect sometimes getting left blank

Let’s Define CSS 4
CSS Scroll Anchoring Module Level 1 Working Draft released
- proposes a mechanism to mitigate this jarring user experience of page moving while the user is in the middle of consuming the content by keeping track of the position of an anchor node and adjusting the scroll offset accordingly
Media Queries Level 5 Working Draft released
- contains extensions and additions to Level 4
- Environment Media Features, Scripting Media Features, Custom Media Queries, User Preference Media Features
- Support for the prefers-reduced-data media query feature
CSS Color Module Level 5 Working Draft released
- extends CSS Color to add colour modification functions
- adds color-mix, color-contrast and a way to modify colours (currently 2 proposals being debated, color-adjust and relative colour syntax)

Proposing new CSS primitives to enable great web experiences on foldable & dual-screen devices
Toward Responsive Elements
While You Weren’t Looking, CSS Gradients Got Better
Ubuntu Terminal in CSS
Chameleonic Header
CSS Can Influence Screenreaders
Quick and Easy Dark Mode with CSS Custom Properties
Why is CSS Frustrating?
When CSS Blocks
monica.css
HTML: The Inaccessible Parts
Negative margins in CSS
📼 Making Things Better: Redefining the Technical Possibilities of CSS