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[cssom] unrecognized rules and properties

From: Mike Wilson <mikewse@hotmail.com>
Date: Sun, 22 Nov 2009 16:14:58 +0100
To: <www-style@w3.org>
Message-ID: <041501ca6b86$8e627f90$0a01a8c0@mikedeskxp>
The current CSSOM draft has removed support for accessing 
unrecognized rules and properties. This is a regression
IMO.

Below excerpts are from the specs:
old: http://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113/css.html
new: http://dev.w3.org/csswg/cssom/

Unrecognized rules:

  old:
    2.2
    Interface CSSRule
    const unsigned short UNKNOWN_RULE = 0;
    ... The CSSUnknownRule interface represents an at-rule 
    not supported by this user agent.

  new:
    7.1.1 
    ... Statements that were dropped during parsing can 
    not be found using these APIs.
    7.2.2
    (UNKNOWN_RULE removed)

Unrecognized properties:

  old:
    2.2
    Interface CSSStyleDeclaration
    ... While an implementation may not recognize all CSS 
    properties within a CSS declaration block, it is 
    expected to provide access to all specified 
    properties in the style sheet through the 
    CSSStyleDeclaration interface.

  new:
    7.3.2
    (no mention)

What case has been made for removing this support? IMO
there are strong arguments for having it.

Best regards
Mike Wilson
Received on Sunday, 22 November 2009 15:15:50 GMT

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