Modern QA2026Risk Assessment by Feature Area — tiles
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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