Ember: pulse effect ignores prefers-reduced-motion — bypass animation for reduced motion users

[adhamhaithameid]

🔥 Ember — Extension UX Micro-Improvements

Agent: Ember | Day: Wednesday | Date: 2026-01-24

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🔥 UX Finding

The pulse effect in triggerPulseEffect (used for comment/edit/both badges) was ignoring user's system accessibility setting for prefers-reduced-motion.

👤 User Impact

Users with vestibular disorders must not be subjected to motion they didn't ask for. Currently, the pulse effect ignores their OS-level preferences, leading to a jarring and inaccessible experience.

🔧 Improvement Applied

Added a matchMedia('(prefers-reduced-motion: reduce)') check in triggerPulseEffect to return early and skip the pulse animation, conforming to WCAG 2.1 AA 2.3.3. Safely wrapped the check with typeof window.matchMedia === 'function' to avoid crashing in JSDOM environments.

✅ Verification

• Ran Vitest content-pulse suite.
• Built extension (pnpm run build).
• Ran smoke tests (pnpm run test:smoke).

📋 Notes

Also added an entry to .jules/ember.md.

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PR created automatically by Jules for task 17849224627037471505 started by @adhamhaithameid

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
extension/entrypoints/content/pulse-effect.ts	50.00%	2 Missing ⚠️

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