Support slot-based Shadow DOM v1

[lacolaco]

Hi teams.
Are you planning to support Shadow DOM v1?
(Spec: http://w3c.github.io/webcomponents/spec/shadow/)

[ebidel]

Definitely! We've discussed starting this work this quarter or the next. @tjsavage for timelines.

[tomalec]

+1 for adding v1 support :)

It is mentioned in Polymer's 2016 Roadmap
It would be cool to see such roadmap for webcomponents.js as well.

Just to be able plan development, and decide according to which spec version should we code. Especially in regards of vanilla Web Components.

[ebidel]

I think webcomponents.js support is implicit in supporting v1 in Polymer, but I could be wrong. cc @tjsavage @azakus @addyosmani

[tomalec]

Once v1 will be shipped, will you still polyfill v0 more or less as Hayato proposed for Blink? https://github.com/w3c/webcomponents/blob/6100444d54d8b759f456fb56fb263473494bf28c/proposals/shadow-dom-v1-in-blink.md

Will you use v0 in Chome to polyfill v1, or are you waiting for v1 to be complete in there?

[tomalec]

Is there any update on this?

Implementation seems to be done in Chromium
https://bugs.chromium.org/p/chromium/issues/detail?id=531990#c127
https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/zrZRD2ls5tw/ibbjD3cQAQAJ

[TimvdLippe]

This has been done in https://github.com/webcomponents/shadydom