Mark ShadowRoot.p.innerHTML standard (#7478)
Mark ShadowRoot.p.innerHTML standard (#7478)

This change marks ShadowRoot.prototype.innerHTML as standard_track:true
and experimental:false.

https://w3c.github.io/DOM-Parsing/#the-innerhtml-mixin (the InnerHTML
interface mixin), normatively defines ShadowRoot.prototype.innerHTML, and
all major browser engines expose ShadowRoot.prototype.innerHTML, so it’s
not experimental.
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data