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'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 https://caniuse.com/style-scoped