- From: Bjoern Hoehrmann <derhoermi@gmx.net>
- Date: Mon, 23 Apr 2007 08:00:52 +0200
- To: Cameron McCormack <cam@mcc.id.au>
- Cc: www-style@w3.org
* Cameron McCormack wrote:
>Is it conforming behaviour for a UA to return null from the call to
>ViewCSS.getComputedStyle() if the element is not something that renders?
>For example:
>
> <svg xmlns='http://www.w3.org/2000/svg'>
> <abc xmlns='http://example.org/' id='a'/>
> <script>
> a = document.getElementById('a');
> s = document.defaultView.getComputedStyle(a, null);
>
> // Is s allowed to be null?
> </script>
> </svg>
>
>SVG states that subtrees rooted in elements, such as the ‘abc’ element
>above, are never rendered. Currently, Batik[1] will return null for any
>element that does not derive from SVGStylable, but I’m wondering if that
>behaviour is correct.
Well if the specification is not very clear about that, it will take a
new edition of the Recommendation to give an authoriative answer, but
while returning `null` for Element objects not in the document is quite
sensible, I don't think that is the case for elements in the document.
In the CSS model, there is a computed value for each property on all
elements in the document, and you should be able to query it using this
method.
--
Björn Höhrmann · mailto:bjoern@hoehrmann.de · http://bjoern.hoehrmann.de
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Received on Monday, 23 April 2007 06:01:00 UTC