See https://wpt.fyi/results/shadow-dom/shadow-root-clonable.html

This is now listed on the interop2024 dashboard.

https://hg.mozilla.org/mozilla-central/rev/5d6cda8dd7c1

https://github.com/validator/htmlparser/commit/177decaf0524d8e04e894a50dd5b48ece41d648b

MDN Docs work for this can be tracked in https://github.com/mdn/content/issues/33160

I have a few questions about the purpose of this feature here - https://github.com/mdn/content/pull/33325#discussion_r1584290677 - would appreciate advice. Specifically we have lots of docs explaining that shadow root is clonable or not-clonable, but nothing on the implications of this - i.e. what it means for web components. Advice welcome.

Somewhat related, it is also clear what delgatedFocus does for a shadow root if granted - it gives focus to the first focusable element in the shadow DOM when you click a non-focusable element.
But what gets the focus if this is not set? I think in this case the focus remains with the original item unless you click a focusable element.

Lastly, HTMLTemplateElement.shadowRootMode obviously reflects the values from the associated <template>.

• The docs indicate that you can't change the value after parsing - is that true? (i.e. - the value is effectively readonly after parsing - even though the property is not marked as read only in the IDl).
• Can you create a new shadow dom by creating or cloning a HTMLTemplateElement with this property set?

FYI, marking docs work as complete. The questions above have largely been answered, and anything outstanding is being looked at in related PRs.