perf(Banner): Optimize CSS :has() selectors for better INP #7324
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- Scope :has(.BannerActions) selectors to shallow path > * > for O(1) lookup - Scope :has(.BannerActionsContainer) to direct child with > combinator Part of #7312
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Summary
Performance optimizations for Banner CSS selectors to improve INP (Interaction to Next Paint).
Changes
:has(.BannerActions)selectors to shallow path> * >for O(1) lookup:has(.BannerActionsContainer)to direct child with>combinatorExpected INP Impact
Why this matters
Banner uses multiple
:has()selectors to detect the presence of actions. These selectors fire on every style recalculation, including hover, focus, and any DOM changes. Scoping to shallow paths eliminates full subtree traversal.Part of the INP performance optimization effort. See #7312 for full context.