Should innerHTML be able to take a Stream?

[samuelgoto]

Given that a large number of apps use innerHTML to construct the DOM, and that a lot lead to taking strings that are fairly large and that come from servers, would it make sense to make innerHTML take something that is Streamable so that it can take things incrementally rather than synchronously? Any chance that could take things off of the main thread?

(filling retroactively from a discussion with @slightlyoff)

[domenic]

This is a dupe of #2142, although that issue is less specific about the proposed solution, so let's roll it into there :)