On Wed, May 6, 2015 at 4:34 PM, Dimitri Glazkov <dglaz...@google.com> wrote:
> This is https://www.w3.org/Bugs/Public/show_bug.cgi?id=24866.
> The way I remember it, the argument went like this: the most common use case
> for this callback is to react to element becoming part of the main document
> (the rough approximation of a nebulous concept "am I useful on the
> screen?"), and making these callbacks be invoked in other cases may just be
> noise for devs.

I see. We know from HTML that a change of parent element might be
significant, e.g. with <picture> or the <details>  element. I'm
inclined to make a proposal here that we change these callbacks to be
the primitives the DOM offers rather than these higher-level


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