On Wed, May 28, 2014 at 6:14 AM, <kgilb...@mozilla.com> wrote:

> Is this behavior acceptable or would it be more desirable to always return
> the actual scroll position in DOM methods?
>

All DOM methods that depend on the scroll position (not just
scrollLeft/scrollTop but getBoundingClientRect etc too) should always use
the most up-to-date value of the actual scroll position that the main
thread has. That's how our existing smooth scrolling behaves. I.e., we
don't lie :-). I'm pretty sure the CSSOM spec requires that for the
ScrollBehavior "smooth" value, too.

Rob
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