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12-3-cross-browser-compatibilityBacklogEpic 12.3

Story 12.3: Cross-Browser Compatibility

**Epic:** Epic 12 - Mobile-First Performance & Browser Support **Story ID:** 12.3 **Created:** 2025-12-08 **Status:** ready-for-dev **Priority:** P1 (High - Users on older browsers may experience breakage) **Effort:** 2-3 hours

Acceptance Criteria

  • [x] **AC-12.3-1:** Autoprefixer adds vendor prefixes automatically (DONE via Tailwind)
  • [x] **AC-12.3-2:** Modern JavaScript transpiled to ES5 (DONE via Next.js)
  • [ ] **AC-12.3-3:** Polyfills loaded for missing browser features (IntersectionObserver, ResizeObserver)
  • [ ] **AC-12.3-4:** CSS fallbacks for unsupported features (backdrop-filter, grid)
  • [ ] **AC-12.3-5:** Browserslist configuration for target browsers
  • [ ] **AC-12.3-6:** Playwright tests on last 2 versions of Chrome, Safari, Firefox, Edge
  • [ ] **AC-12.3-7:** Feature detection using @supports for modern CSS
  • [ ] **AC-12.3-8:** Graceful degradation for unsupported features
  • [ ] **AC-12.3-9:** Console warnings for unsupported browsers (< targets)
  • [ ] AC-12.3-10: BrowserStack integration for real device testing
  • [ ] AC-12.3-11: Browser compatibility badge in footer

Progress

Tasks0/0
Acceptance Criteria11
Total Tasks0

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