Level 3 · Practice

Senior practice pages

Ten pages focused on accessibility, responsiveness, state, and edge cases. New to this level? Start with the Senior Tester introduction. Read senior techniques first, or jump to Learning for deep-dive walkthroughs.

Accessibility (a11y)

Missing ARIA, contrast, keyboard navigation.

Responsive layout breaks

Mobile/tablet breakpoints that fail.

Browser quirks

Rendering differences across browsers.

State management bugs

UI state that doesn't reset, persist, or sync.

Loading & async states

Spinners missing, race conditions, stale data.

Navigation & routing

Back button, deep links, 404 handling.

Session & auth edge cases

Expired sessions, role mismatches.

Error recovery flows

What happens after an error — can you recover?

Cross-level regression

Fixing one thing that breaks another.

Exploratory charter

Open-ended: find as many bugs as possible.