W3C home > Mailing lists > Public > public-web-perf@w3.org > November 2013

Re: [ResourcePriorities] Blocking content resources on CSS properties

From: Boris Zbarsky <bzbarsky@MIT.EDU>
Date: Wed, 06 Nov 2013 14:04:59 -0500
Message-ID: <527A92DB.6060304@mit.edu>
To: "Tab Atkins Jr." <jackalmage@gmail.com>
CC: Jatinder Mann <jmann@microsoft.com>, Simon Sapin <simon.sapin@exyr.org>, "public-web-perf@w3.org" <public-web-perf@w3.org>, Ivan Kotenkov <kotenkov@yandex-team.ru>, www-style <www-style@w3.org>
On 11/6/13 1:41 PM, Tab Atkins Jr. wrote:
> Nah, I'm fine with applying it to content resources, with the caveat
> outlined above that UAs may ignore it and preload anyway during the
> initial load

I'm not, because this requires UAs to synchronously perform style 
computation after onload in cases when they don't have to do it right 
now... and we don't want to require that sort of thing synchronously. 
It's especially bad in subframes, where style computation means doing a 
sync layout on the ancestor document and all its ancestors because that 
affects media queries which affects style computations...

-Boris
Received on Wednesday, 6 November 2013 19:05:30 UTC

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