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Re: [cssom] Proposing a getDefaultComputedStyle method

From: Simon Pieters <simonp@opera.com>
Date: Wed, 24 Apr 2013 13:50:59 +0200
To: "www-style list" <www-style@w3.org>, "Boris Zbarsky" <bzbarsky@mit.edu>
Message-ID: <op.wv1m69eoidj3kv@simons-macbook-pro.local>
On Fri, 12 Oct 2012 20:36:33 +0200, Boris Zbarsky <bzbarsky@mit.edu> wrote:

> Proposal: a getDefaultComputedStyle method that acts just like  
> getComputedStyle but returns what the style would be if it were not for  
> author rules.
>
> Rationale: jQuery has hacks to try to figure out default styles,  
> involving creation of subframes and so forth.  These hacks are very  
> fragile.  There's got to be a better way for libraries to do this sort  
> of thing.
>
> IDL:
>
>      CSSStyleDeclaration
>        getDefaultComputedStyle(Element elt,
>                                optional DOMString pseudoElt);
>
> Behavior is just like getComputedStyle except:
>
> 1) Ignores all author-level sheets, transitions, animations,
>     override stylesheets.
> 2) Never returns used styles, only computed ones (just like
>     getComputedStyle would for a display:none element).
>
> My implementation at the moment also ignores presentational hints, but  
> I'm open to changing that if people think it would be better to include  
> them.

Done. https://dvcs.w3.org/hg/csswg/rev/4311a171b0cb

I think presentational hints are supposed to be like author-level styles,  
so I didn't include them.

> See also https://bugzilla.mozilla.org/show_bug.cgi?id=800983 for the  
> implementation and https://bugzilla.mozilla.org/show_bug.cgi?id=797029  
> for the jQuery issues that prompted this suggestion.  The jQuery folks  
> sound like they would really like something like this, for what it's  
> worth.
>
> -Boris


-- 
Simon Pieters
Opera Software
Received on Wednesday, 24 April 2013 11:51:36 UTC

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