W3C home > Mailing lists > Public > www-style@w3.org > December 2012

Re: [css-display-viewport] Enabling fast layout for web apps via isolation

From: L. David Baron <dbaron@dbaron.org>
Date: Thu, 20 Dec 2012 14:59:06 -0500
To: Boris Zbarsky <bzbarsky@MIT.EDU>
Cc: www-style@w3.org
Message-ID: <20121220195906.GA7149@crum.dbaron.org>
On Thursday 2012-12-20 11:51 -0800, Boris Zbarsky wrote:
> On 12/20/12 11:46 AM, Simon Fraser wrote:
> >Not necessarily. WebKit has a "layout positioned objects only" optimization that attempts to make moving out-of-flow positioned elements fast.
> 
> More precisely, WebKit has a spec violation that attempts to make it
> fast.  See http://dbaron.org/css/test/2003/abs-pos-intrinsic3 for a
> testcase WebKit fails as a result.  There should be no horizontal
> scrollbar on that page.

That said, there are many cases that *can* be optimized; just not
all cases.  Gecko has a similar optimization, but it's actually
currently erring on the side of not optimizing as many cases as I'd
like it to.

-David

-- 
𝄞   L. David Baron                         http://dbaron.org/   𝄂
𝄢   Mozilla                           http://www.mozilla.org/   𝄂
Received on Thursday, 20 December 2012 19:59:37 GMT

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