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Re: [selectors] Previous-sibling combinator?

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Thu, 12 Feb 2015 09:57:52 +1100
Message-ID: <CAAWBYDBFpo8Pw3hyVEMwzsvYoKpLhjzbEffGmGjr2EbP3iaDTw@mail.gmail.com>
To: Benjamin Poulain <benjamin@webkit.org>
Cc: Liam R E Quin <liam@w3.org>, Marat Tanalin <mtanalin@yandex.ru>, Clive Chan <doobahead@gmail.com>, Brad Kemper <brad.kemper@gmail.com>, Henrik Andersson <henke@henke37.cjb.net>, www-style list <www-style@w3.org>
On Thu, Feb 12, 2015 at 9:52 AM, Benjamin Poulain <benjamin@webkit.org> wrote:
> On 2/11/15 2:47 PM, Tab Atkins Jr. wrote:
>> The problem with "giving people enough rope to hang themselves" is
>> when the mere existence of the feature slows down or complexifies the
>> engine as a whole, regardless of whether it's used.
>
> Can you explain this? Why is that the case?

Because being able to handle style invalidations from arbitrarily high
up in the tree prevents simplifications that assume that can't happen;
at minimum, it probably adds branches in the code which can have
measurable perf effects.

~TJ
Received on Wednesday, 11 February 2015 22:58:40 UTC

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