On Feb 15, 2014, at 4:07 PM, Ryosuke Niwa <rn...@webkit.org> wrote:
> Hi all,
>
> Now that we've removed all of the existing shadow DOM implementations from
> trunk in http://trac.webkit.org/changeset/164131, I'm intending to work on
> new web components implementations in a branch based on the feedback Apple
> has given on public-webapps and www-style in near future, probably starting
> with custom elements.
>
> I'd like to implement them in a branch to not inadvertently introduce
> performance regressions. The old implementation on trunk resulted in 5%
> overall slowdown in the page load time but we didn't quantify that until we
> removed the feature entirely last year. That's probably because the feature
> was added over years as a pile of small changesets each of which introduced
> immeasurably small performance regressions. Development in a branch allows a
> faithful performance comparison between the two.
This is great news!
All jokes aside, these are exciting features, but it’s important that we’re
honest with ourselves about overall engine impact.
-Kling
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