Right now we delegate it to the element (and eventually to nsCSSPseudoClasses::MatchesElement), but it depends on the value of the "mozbrowser" attribute, kinda indirectly. Also, we should ensure snapshots capture this attribute on <iframe>/<frame> elements. Not sure how to write a testcase for this, since it's not accessible from webpages and neither is "mozbrowser" stuff in general.
This is similar to bug 1365160.
Priority: -- → P2
Err, bug 1365159.
Handling this in bug 1365159. Also not sure how to test this...
Status: NEW → RESOLVED
Last Resolved: a year ago
Depends on: 1365159
Resolution: --- → FIXED
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