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CSS @supports statement

Use new selectors responsibly with selector queries

Just in time for Selectors Level 4

Firefox 69 was the first to implement selector feature queries, but other browsers are following suit. I’ll show you how it works, and how to start using this new feature query right away.

There are many ways to start using a new feature in CSS without waiting for full cross-browser support, but “feature queries” are the most clear and explicit. We can use them to test for browser support, and provide targeted styles only where they are supported. Now we can do the same with new selectors, like ::marker or :focus-visible!

Selector queries allow us to finesse browser-support in new ways

Upcoming Workshop

Mia from behind,
standing at a laptop -
speaking to a conference audience
and gesturing to one side

Cascading Style Systems

A workshop on resilient & maintainable CSS

New CSS features are shipping at an unprecedented rate – cascade layers, container queries, the :has() selector, subgrid, nesting, and so much more. It’s a good time to step back and understand how these tools fit together in a declarative system – a resilient cascade of styles.

Register for the October workshop »

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