Add support for reduced-motion on opacity animations

[adierkens]

Closes https://github.com/github/primer/issues/5419

• Adds support for reduced-motion that disables the opacity animations for TooltipV2 and Overlay (used by the Select Panel).
• Removes the *-fetch SelectPanel visual tests
• Uses reduced-motion in the playwright visual tests to avoid flaky screenshots related to CSS animations.

Changelog

Changed

Removes opacity animations from TooltipV2 and Overlay when prefers-reduced-motion is enabled

Rollout strategy

• Patch release

Testing & Reviewing

Check the Tooltip and Overlay (Select Panel) components behave identically (without setting prefers-reduced-motion).

To test w/ reduced-motion in Chrome:

• Open the dev tools
• Use CMD + Shift + P to open the run menu
• Type reduced
• Click on Emulate CSS prefers-reduced-motion: reduce
• Use the same instructions to disable

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

🦋 Changeset detected

Latest commit: 21d23de

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/react	Patch

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	91.9 KB (0%)
packages/react/dist/browser.umd.js	92.23 KB (0%)

[Copilot]

Pull Request Overview

This PR adds support for prefers-reduced-motion accessibility preference to disable opacity animations in TooltipV2 and Overlay components. This improves accessibility for users who prefer reduced motion due to vestibular disorders or other motion sensitivities.

• Wraps CSS animations in media queries to respect user's reduced motion preferences
• Updates visual regression tests to use reducedMotion: 'reduce' for consistent screenshots
• Removes problematic fetch-related visual tests that were causing flaky results

Reviewed Changes

Copilot reviewed 4 out of 22 changed files in this pull request and generated 1 comment.

File	Description
packages/react/src/TooltipV2/Tooltip.module.css	Wraps animation styles in prefers-reduced-motion media query
packages/react/src/Overlay/Overlay.module.css	Moves overlay animation inside prefers-reduced-motion media query
e2e/components/TooltipV2.test.ts	Updates visual tests to use reducedMotion emulation
e2e/components/SelectPanel.test.ts	Updates visual tests and excludes fetch-related stories

[langermank]

These seem like good changes, though I do wonder if this issue will come up again since we're mostly relying on changes to the components to fix it. Not all animations really need to be gated by that media query but I suppose it doesn't hurt!

[adierkens]

These seem like good changes, though I do wonder if this issue will come up again since we're mostly relying on changes to the components to fix it. Not all animations really need to be gated by that media query but I suppose it doesn't hurt!

Agreed. I don't love that we have to update the components to account for it -- I'm working on a small repro example to send over to playwright and hopefully get a real fix in.