Welcome back to the new season of the CSS Podcast, where Una and Bramus are your guides, your cohosts, and your CSS best friends. In this episode we dig into two very powerful new CSS features: inline conditionals with the if() function, and custom functions.

Resources: CSS if() function specification → https://goo.gle/3IBChWo Article on if() by Una → https://goo.gle/4nUxIp2 Article on if() by Lea Verou → https://goo.gle/4nt2UvS CSS mixins specification → https://goo.gle/48H8SEH Article on @function by Una → https://goo.gle/48H99rd Article on @function and if() by Bramus → https://goo.gle/46qPbzy The CSS Space Toggle by Chris Coyier → https://goo.gle/4874qio

Una Kravets (co-host) Twitter | Instagram | YouTube Making the web more colorful ✨🎨 Web DevRel @googlechrome Unicorn face host of @toolsday & Designing in the Browser 🎬

Bramus Van Damme (co-host) Bluesky | Mastodon | YouTube | Website @GoogleChrome CSS DevRel; @CSSWG; Scuba Diver 🤿

O'Reilly Update Morning Edition, October 16, 2025