Re: [w3ctag/design-reviews] Declarative CSS Modules and Declarative Shadow DOM `adoptedstylesheets` attribute (Issue #1000)

LeaVerou left a comment (w3ctag/design-reviews#1000)

> Just to double check, is TAG fine with `<template shadowrootmode="open" shadowrootadoptedstylesheets="./styles.css">`, as in, something that looks like a URL in an attribute, but will not fetch. It will only work if it's previously been fetched.
> 
> Does anything else on the platform behave like this?

As far as I know, nothing else on the platform behaves like this. I’m no longer in the TAG, but I would personally consider this a huge author footgun. I suspect this was simply not noticed during the design review, exactly because it's so unprecedented.

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Received on Wednesday, 11 February 2026 18:18:32 UTC