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8.2Risk Assessment by Feature Area
| Area | Cross-Browser Risk | Testing Priority | Notes |
|---|---|---|---|
| CSS Grid / Flexbox layout | Low (well-standardized) | Tier 2 | Consistent across modern browsers |
CSS has(), container queries |
Medium (newer features) | Tier 1 | Safari lagged on some features |
| JavaScript core | Very low | Tier 3 | ES2020+ is universal in modern browsers |
| Web APIs (WebRTC, WebGL, etc.) | High (implementation varies) | Tier 1 | Each browser implements differently |
Form controls (<input type="date">) |
High (wildly different) | Tier 1 | Native date pickers vary enormously |
| Font rendering | Medium (visual differences) | Visual regression | Sub-pixel rendering differs by OS/browser |
| Scrolling behavior | Medium (inertia, overscroll) | Tier 2 | iOS momentum scrolling is unique |
| Touch vs mouse events | High | Tier 1 on mobile | Event order and timing differ |
| Clipboard API | High (permissions differ) | Tier 1 | Safari requires user gesture, Chrome does not |
| File upload / drag-and-drop | Medium | Tier 2 | Drop zone behavior varies |
| Print stylesheets | Low (rarely tested) | Manual spot-check | Pagination differs by browser |
| CSS animations / transitions | Low | Tier 3 | Performance varies, visual output is consistent |
| Media playback (video/audio) | High | Tier 1 | Codec support, autoplay policies vary |
| WebSocket / SSE | Low | Tier 3 | Well-standardized |
| IndexedDB / localStorage | Low | Tier 3 | Storage limits vary but API is consistent |