Re: [WICG/webcomponents] Preventing re-renders prior to first call to `connectedCallback()` (Issue #1081)

Thanks @justinfagnani for taking an interest.

In this case, I want to stick with mixing JS and HTML. The problem I foresee isn't the template parsing, as I have that worked out. I will encounter the specific problem mentioned by @WebReflection regarding the inability to assign to `this.innerHtml` before the parser closes the custom HTML tag.

So I'm a plus one for:

> This is the reason we've been asking a lot a way to have the possibility to operate on Custom Elements once their end tag is either reached or implicitly enforced by the parser

Having a callback and hopefully a flag to validate I can assign to `this.innerHtml` would be ideal and would also solve my original problem described in the description.

I'm concerned the `<script defer` or `setTimeout()` solutions/hacks mentioned by @Danny-Engelman introduce a greater degree of uncertainty and unpredictability for the timing of script execution.

@justinfagnani, I'd like to reach out, because looking briefly at your library, I think we will encounter many of the same problems you may have already tackled.

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