1371487 - stylo: We could enable limited style sharing between elements that have the same rules but different pseudo-element rules

Status: NEW

(Core :: CSS Parsing and Computation, enhancement, P4)

Description

[Boris Zbarsky [:bzbarsky]]

Now that we've done bug 1329361, I think we could add one more improvement on top of it if we wanted to.

Specifically, if we split revalidation selectors into ones for the element and ones for pseudo-elements, then even if one of the pseudo-element revalidation selectors fails we could still share the element's ComputedValues.  We'd need to grab it and then run the "match the eager pseudos" bits from matching.rs to produce the right ElementStyles.

This is probably low-priority for now, since I'm not sure whether there are cases in practice in which this adds significantly to the sharing we can already do.  Not marking this as blocking "stylo" for that reason.

Comment 1

[Chris Peterson [:cpeterson]]

status-firefox57=wontfix unless someone thinks this bug should block 57