innerHTML should be defined on ShadowRoot interface in addition to Element interface

[rniwa]

In the world where ShadowRoot interface is merged into DOM (as done in the WHATWG version), it's more natural for the DOM parsing & serialization spec to define innerHTML IDL attribute on both Element and ShadowRoot interfaces.

[foolip]

FWIW, Chromium and WebKit both have this already. (I came here trying to figure out what to do about that.)

[domenic]

The hard part here is figuring out the context element. Once we do that, it's easy to spec. @rniwa @tkent-google @smaug---- can you let us know what your implementations of ShadowRoot's innerHTML do in that regard?

[rniwa]

WebKit uses the host element as the context element.

[smaug----]

(Github is behaving oddly today)

Gecko uses host as context, https://searchfox.org/mozilla-central/rev/0ec9f5972ef3e4a479720630ad7285a03776cdfc/dom/base/FragmentOrElement.cpp#2309-2313

[tkent-google]

Blink also uses the host element.

[rniwa]

Sounds like this is ready to be spec'ed as such then.