[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 #7 from Antti Koivisto <koivisto at iki.fi> ---
The test case has lots of custom element instances (some 6000) that each have a :host rule with a bunch of variable declarations. For some (immediately non-obvious) reason the button click causes a full style recalc on all shadow trees. That takes a while due to large number of style scopes as well as our suboptimal variables implementation.

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