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We have Custom Elements, but do we also need Custom Attributes? This was discussed at TPAC. Is it something you'd like on the platform? https://github.com/WICG/webcomponents/issues/1029

Christian "Schepp" Schaefer

@schepp.dev

1 Dec 2025

I like the idea. But why not go all in and open this mechanic for arbitrary CSS selectors? Then we could get lifecycle hooks for any element that we wish.

Jake Archibald

@jakearchibald.com

1 Dec 2025

I think the trickiness here is that style calculation is usually deferred

Christian "Schepp" Schaefer

@schepp.dev

🙁 In my projects I usually use a Mutation Observer which recursively listens on the root node, that uses a target.matches() to decide if and how to initialize elements in the DOM. And that seems to do the job quick enough.

1/12/25, 8:25 pm0 reposts3 likes

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