Nicholas Rice

> Any objection to me doing some prototyping on this? I might have some time this weekend and could see how far I got and what issues came up. Nope....

I work on a Web Component project and I would also be interested in seeing Shadow DOM (and related Custom Element APIs) support! I'm curious, what is the reason(s) Custom...

Tested on Mac, seems to be working.

> * In order to more consistently detect if `ElementInternals` has already been attached to the source element, I think either `FASTElement` or `ElementController` would need to be updated with...

This behavior is a byproduct of some DOM changes being routed through `DOM.queueUpdate` while others are not. At a high level, what is happening in the above min-repro is: 1....

Yea I'll poke around more. This seems to be be primarily an issue during initial binding and construction, but I suppose it could manifest anytime the property value is set...

Some investigation work for this going on here: https://github.com/microsoft/fast/tree/users/nirice/ssr-invesigation