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CopilotAI
changed the title
[WIP] Chore ensure max-height does not surpass viewport height in Overlay, ActionMenu
Apply review feedback: fix initialFocusRef, positioning, and mobile viewport handling
Feb 10, 2026
👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Or, apply the integration-tests: skipped manually label to skip these checks.
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francinelucca
merged commit 
Addresses technical debt from PR #7510 review comments: corrects focus management, CSS positioning, and mobile Safari viewport calculations.
Changelog
Changed
Overlay.module.cssandActionMenu.module.css: Replace100vhwith100dvhin max-height calculations to prevent clipping behind mobile browser chromeOverlay.features.stories.tsx: AttachconfirmButtonRefto close button for proper initial focus behaviorOverlay.features.stories.module.css: Addposition: relativeto.ScrollableContentto establish containing block for absolutely positioned close buttonRollout strategy
Testing & Reviewing
Storybook "SettingMaxHeight" example validates focus trap and scrollable content behavior. Mobile Safari testing confirms overlays no longer clip behind browser UI.
Merge checklist
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