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Re: [CSSOM] Revisiting transforms and getBoundingClientRect()

From: Simon Fraser <smfr@me.com>
Date: Thu, 08 Sep 2011 11:25:55 -0700
Cc: "www-style@w3.org list" <www-style@w3.org>
Message-id: <57E44694-C163-423D-AD2D-96C964EC87DA@me.com>
To: Erik Arvidsson <arv@chromium.org>

On Sep 8, 2011, at 10:03 AM, Erik Arvidsson wrote:

> On Wed, Sep 7, 2011 at 22:34, Robert O'Callahan <robert@ocallahan.org> wrote:
>> It would be difficult to expose a synchronous "onlayout" event to Web
>> content safely, and it would be pointless to make it asynchronous.
> 
> I don't think it would be pointless to have an async event that would
> be dispatched when we know that the layout is non dirty at some point
> before the next paint. At this point getting the layout rects would be
> cheap.
> 
> I agree that exposing a sync layout event sounds scary. Hello sync
> mutation events!
> 
> For debugging purpose I would love to have a way to "blow up" if a
> layout is happening when I don't expect it. This is definitely
> something the Firebug and Web Inspector could expose and does not need
> any standardization but I do think it requires cooperation from the
> code.

WebKit's web inspector does expose this, via the "Timeline" panel. It even tells you how long those layouts took.

Simon
Received on Thursday, 8 September 2011 18:27:03 GMT

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