137395 - event state changes don't work when state selector not on subject [SELECTORS-DYNAMIC]

Status: VERIFIED INVALID

(Core :: CSS Parsing and Computation, defect)

Description

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

The HasStateDependentStyle optimization prevents event state selectors from
working on any element that is not the subject of the relevant selector.  See
bug 137247 comment 5, bug 5693 comment 161, and bug 75559.

Comment 1

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

See also bug 15608, which used to cover both this problem and another problem.

Comment 2

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Attachment: testcase

This tests both ">" and "+" combinators.

Comment 3

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Attachment: corrected testcase

Oops.  Fixed a small error.

Note that the first of the two testcases here is also affected by bug 15608. 
Also note that putting :link:hover, :visited:hover { background: yellow; } in
your userContent.css (as I have) should make this go away.

Comment 4

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Hmmm.  Maybe I'm going crazy and this isn't a bug?

Comment 5

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Never mind.  I'm going crazy.  This isn't a bug, because we build
mStateSelectors specially for this case.

Comment 6

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

I added some comments describing what I misunderstood to the patch in bug 128743.

Comment 7

[Hixie (not reading bugmail)]

rubber stamp VERIFIED since reporter invalidated