CSSStyleSheet constructor and shadowRoot.adoptedStyleSheets

Jan Scheurer

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Mar 16, 2022, 4:28:47 PM3/16/22

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In firefox 96 on linux both of these features are implemented and functional(maybe I set a flag somewhere ages ago?), however in firefox 98 on MacOS neither work, caniuse shows them as not supported, the bugzilla issue tracking adoptedStyleSheets was closed as resolved two years ago.

What's the official stance on these features? I'd really like to use them to not have style tags in shadow dom, especially for custom elements that may be instantiated in the hundreds if not thousands.

Regards

Sebastian Zartner

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Mar 17, 2022, 2:50:32 AM3/17/22

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I'm not a Mozilla employee, though I can say that the feature is still behind a flag called layout.css.constructable-stylesheets.enabled. The related bugs are https://bugzil.la/1520690 for its implementation which is obviously not complete yet and https://bugzil.la/1644102 for enabling it by default.

Sebastian

Jan Scheurer

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Mar 17, 2022, 5:57:28 AM3/17/22

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Thank you Sebastian, that was the flag I activated!
Good to see that there's still some progress being made on getting those features to mainline.

Best regards

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