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It's time for Interop 2026! This is a cross-browser effort where we agree on a set of focus areas to improve compatibility. Here's how things went in 2025, and what we're taking on for 2026: hacks.mozilla.org/2026/02/laun...

I wish attr() could be used for <url> values like background-image, I appreciate this is a mess, see: developer.mozilla.org/en-US/docs/W... But this has got to be the main use case. I’m still annoyed at the complex or insecure CSP workarounds a CMS needs to use to set a background image.

Yeahhhh, security said no to this. Hopefully it's something we can look at again, later down the line.

I just can’t see the diff (from a security point of view) between: background-image: url(attr(data-icon)); background: image-set(attr(data-icon));

tbh, I haven’t checked (currently on my phone), but the MDN article suggests it is allowed: developer.mozilla.org/en-US/docs/W... “Some functions - such as image-set() … allow attr() to work in those contexts, depending on browser support”