[Webkit-unassigned] [Bug 222187] REGRESSION(iOS 14): Using Web Components with large quantities of CSS Variables in Shadow DOM results in performance issues

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222187

--- Comment #14 from Antti Koivisto <koivisto at iki.fi> ---
The issue is that hovering the element causes us to invalidate the entire shadow tree style. Since everything here is in a shadow tree that's a big invalidation. 

The invalidation is triggered by the UA stylesheet having some :hover rules targeting pseudo elements in UA shadow tree. This should not require invalidation except for those specific elements.

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