Re: [whatwg/dom] Side effects due to tree insertion or removal (script, iframe) (#808)

> Elements that trigger a script-executing side effect due to insertion or removal need to do so using some kind of queue if we ever want to remove mutation events fully

By some kind of queue, do you mean that they need to fire events and run script asynchronously by posting a task instead of synchronously? I wasn't familiar with mutation events before this and I'm still not super familiar with mutation observer - are mutation events synchronous and is mutation observer async?

> Chrome and Firefox have this model for script insertion.

By this model, do you mean they do sync as opposed to async? Should script tags have their script executed async to when they are appended?

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