CSS attr function

CSS Gets a Class Prefix Selector, and It's 20x Faster Than Attribute Selectors

Two weeks ago, at the CSS Working Group's in-person meeting in Berlin, the group resolved to add a new selector to the Selectors Level 5 spec: the class prefix selector. The syntax is one you'd write in your sleep.

Aug 31, 2026 3 min read

CSS attr function

The attr() Function Finally Grows Up

The typed `attr()` function finally lets HTML attributes drive real CSS values — lengths, colors, and angles parsed straight from markup with type hints and fallbacks. Here's how to replace JavaScript glue code with declarative styling.

Aug 03, 2026 4 min read