fix specificity of :-moz-any()

NEW
Unassigned

Status

()

Core
CSS Parsing and Computation
7 years ago
2 years ago

People

(Reporter: dbaron, Unassigned)

Tracking

(Blocks: 1 bug)

Trunk
Points:
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Dependency tree / graph

Firefox Tracking Flags

(Not tracked)

Details

(Reporter)

Description

7 years ago
Shortly I'm going to land bug 544834, which implements the :-moz-any() selector.  This patch, however, doesn't handle specificity properly; it just treats :-moz-any() as having the specificity of a pseudo-class.

The various ways we could fix this are described in
http://lists.w3.org/Archives/Public/www-style/2010Feb/0263.html .  Ideally we'd use the last one.

Updated

7 years ago
Assignee: nobody → hyatt

Updated

7 years ago
Assignee: hyatt → nobody

Comment 1

7 years ago
Oops, thought I was editing a WebKit bug.  Disregard my re-assignment.

Comment 2

7 years ago
(In reply to comment #0)
> The various ways we could fix this are described in
> http://lists.w3.org/Archives/Public/www-style/2010Feb/0263.html .  Ideally we'd
> use the last one.

@dbaron: You mention that the last one is ideal, whereas in the w3c mailing list point, you mention that the next-to-last one might be best. Which do you mean?

If you mean the next-to-last one, I propose a solution:

In the blog post, you mentioned that this selector is slower when it is the right-most selector, since it isn't in the tag bucket. Couldn't this new selector simply be treated as syntactic sugar and be pre-compiled (expanded in this case) to "regular" CSS before matching? Then "p:any(:hover,#mypara)" would expand to "p:hover, p#mypara" which would have the proper specificity. Doing this would not require a new code path for matching.

Comment 3

7 years ago
I just read that you wrote in the bug for the implementation:

> I expect this will speed up some existing selectors in our user-agent
> stylesheets.

In that case, my proposal is probably faster than the existing implementation
when -moz-any() is used as the right-most selector (assuming that matching is
slower than pre-compilation) but slower otherwise. I wonder which is the common
case?
(Reporter)

Updated

5 years ago
Blocks: 730280
Blocks: 730835

Updated

2 years ago
Blocks: 906353
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