Open Bug 1845291 Opened 3 years ago Updated 2 years ago

:has Selector Caching - Improvement for `querySelectorAll`

Categories

(Core :: CSS Parsing and Computation, enhancement)

Product:
Core
Component:
CSS Parsing and Computation
Type:
enhancement

Tracking

()

People

(Reporter: dshin, Unassigned)

References

(Blocks 1 open bug)

Details

Current cache improvement only recalls match/non-match at the level the selector check is made, not at subtree levels.

This means we still do many checks in case of div > ... > div > .a on document.querySelectorAll(":has(.a)").

While it's relatively easy to store all subtree matches, that can grow big under some conditions (e.g. :has(> .foo > .a) and .div1 .div2 > .foo > .a, but with many .div2 branches).

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