Mozilla Developer Newsletter
Experimental CSS: Masonry layout without JavaScript

Jen Simmons is a member of the CSS Working Group. In this Codepen demo, she explores an experimental implementation of a potential CSS specification to support a masonry layout without using JavaScript. To experience it, visit the demo in Firefox Nightly (or Developer Edition) and follow her instructions to enable the relevant CSS features.
Find Out More



Other News


Experimental CSS: where()

Byte for byte, JavaScript is expensive. Adding flexibility to CSS makes it possible to accomplish more with less code, which can have a significant impact on performance. Firefox Nightly and Developer Edition are the first to support the CSS pseudo-class :where() , which provides developers a new way to signal their intent in CSS declarations.

Read The Spec →

Stable CSS for performance: Faster image loading now
video thumbnail with photo of Jen Simmons and screenshot of Firefox DevTools

Jen Simmons explains how to use CSS to improve your image loading performance (and user experience) in this Mozilla Developer video.

Watch Now →

Stable CSS for accessibility: Using outline

Mozilla Tech Speaker Wojtek Połowniak recently launched a platform/personal blog created with #a11y and #performance in mind. His most recent article explains why and how to use the CSS outline property.

Learn Now →

Pre-release Goodies
Firefox DevTools Compatibility panel

Check CSS browser compatibility easily in Firefox DevTools. Find the Compatibility panel in the Inspector sidebar in Firefox, Nightly or Developer Edition.

Try It Out →



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