Re: Proposal: position:fixed elements should form new stacking contexts

On Thu, May 17, 2012 at 6:34 PM, Robert O'Callahan <>wrote:

> On mobile, asynchronous scrolling of pages with fixed-pos elements is not
> fully done yet, which may be why you see jank there currently. We do have
> the limitation that asynchronous scrolling doesn't work for scrolled
> elements that have been split into multiple layers. As you note, that is
> pretty rare.

I guess you could say that changing the spec would make it easier for us to
do asynchronous scrolling of pages that currently interleave fixed-pos
content with scrolling content. But that would only help us on pages we'd
have broken the rendering of, so I don't find it a compelling argument :-).

I don't particularly object to changing the spec assuming you have data
showing that on mobile *and desktop* this doesn't break sites. Especially
if you're willing to take the lead on the compatibility break on desktop!
(I may however claim an IOU for "small but slightly-compat-breaking spec
change to simplify our engine" :-).)

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Received on Thursday, 17 May 2012 06:51:07 UTC