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Re:Declarative Shadow DOM by marcosdumay on Friday October 02, 2020 @12:38PM (#24664359)
> wasn't shipping in any browser

I've seen it work on Chrome, Firefox and Edge. But at the time I discovered it, Chrome had already scheduled it for exclusion.

Re:Declarative Shadow DOM by esprehn on Saturday October 03, 2020 @02:42AM (#24670122)
I'm pretty sure it was never implemented in Edge and I know it was never shipped in Chrome, but you're right I misspoke above.

It was shipping in Firefox when I removed it from Chrome. It was moved behind a flag in Firefox shortly after and then support was removed.

https://caniuse.com/style-scoped