Re: Why can't we just use constructor instead of createdCallback?

On Thu, Dec 5, 2013 at 9:03 PM, Ryosuke Niwa <rniwa@apple.com> wrote:

> On Dec 5, 2013, at 8:43 PM, Dimitri Glazkov <dglazkov@chromium.org> wrote:
>
> There were several threads around this in March/April, but the main gist
> is that we can't allow running user code when the parser is building the
> tree, and thus we would need to decouple the timing of the constructor
> being called from the [[Construct]] internal method to make constructors
> workable.
>
>
> That sounds like an implementation detail of Blink/WebKit.  Also, JS
> "wrappers" aren't even constructed immediately for builtin elements in
> WebKit and Blink so delaying the construction of elements until later time
> (e.g. end of micro task) seems fine.
>

FWIW, the concern was brought up first by Microsoft's Tony Ross and then
separately Mozilla's Jonas Sicking. Technically, both Blink and WebKit are
capable of doing this. It's just mostly a terrible idea to interrupt tree
construction with user code. Delaying construction of elements until end of
microtask doesn't solve the problem -- you're just shifting the timing of
tree construction.

:DG<