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Re: [cssom-view] Correction and clarification for the coordinate systems of getClientRect/getBoundingClientRect

From: Simon Pieters <simonp@opera.com>
Date: Thu, 19 Sep 2013 11:07:47 +0200
To: "Dirk Schulze" <dschulze@adobe.com>
Cc: www-style <www-style@w3.org>, "Robert O'Callahan" <robert@ocallahan.org>
Message-ID: <op.w3nia9xgidj3kv@simons-macbook-pro.local>
On Thu, 19 Sep 2013 06:53:05 +0200, Dirk Schulze <dschulze@adobe.com>  
wrote:

>
>> On Sep 18, 2013, at 2:18 PM, "Simon Pieters" <simonp@opera.com> wrote:
>>
>> On Fri, 25 Nov 2011 01:12:06 +0100, Robert O'Callahan
>> <robert@ocallahan.org> wrote:
>>
>>> [snip]
>>>
>>> The spec currently says to treat an SVG <foreignObject> as  
>>> establishing a
>>> new viewport. Gecko does this, but Opera and Webkit don't.
>>> (getClientRects
>>> etc seems to not work inside foreignObject at all in IE9.) At least for
>>> the
>>> purposes of getClientRects/getBoundingClientRect, I think the spec  
>>> should
>>> change to have <foreignObject> not establish a viewport. [snip]
>>
>
> Well, CSSOM-view can not just chAnge the specification for  
> <foreignObject> and not make it establish a viewport anymore. I think it  
> should and needs to be fixed in implementations. I was not aware that  
> WebKit doesn't to be honest.

CSSOM View's definition of viewport doesn't affect the SVG spec's  
definition of viewport or how <foreignObject> is defined to work. The  
change only affects getClientRect et al in CSSOM View. Given that we're  
discussing introducing new APIs to handle transformed shapes etc, I think  
it's reasonable to aim for the shortest path to interop for these methods.

-- 
Simon Pieters
Opera Software
Received on Thursday, 19 September 2013 09:08:20 UTC

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