- From: Tab Atkins Jr. <jackalmage@gmail.com>
- Date: Wed, 6 Feb 2013 12:24:47 -0700
- To: www-style list <www-style@w3.org>
While making the recent commits, I made the grammar of custom properties be: [ <value> | <CDO> | <CDC> ]* This means that the value of a custom property can be nothing. This is useful from an authoring perspective - without it, variables can't ever be used to control something which has a special effect when omitted, like the "inset" keyword in box-shadow. It violates the CSS 2.1 Section 4 grammar, though, which requires property values to contain at least one non-comment or whitespace token. However, it's not technically problematic - the Syntax spec accidentally handled it already. I believe Glenn brought up a related issue, which is that it would be difficult to tell in the OM between a property set to nothing and one not set at all. This can be avoided by using the new "var" property on CSSStyleDeclaration, as only valid variables show up there. (You can use " 'foo' in style.var " to test it.) This is the intended method to interact with variables anyway, as it's more convenient, so we can probably ignore this issue. ~TJ
Received on Wednesday, 6 February 2013 19:25:34 UTC