UA Ledger · Playable Test Bench · draft for review
Teaching laboratory. Cases run in this page against the authored functions. This is not a device panel, network approval, analytics-delivery proof or campaign result. Inputs are synthetic.
A second touch should not steal an object already being dragged. This fixture makes pointer ownership explicit and checks that unrelated move events cannot alter the active interaction.
Primary documentation: MDN: pointer owner (body read 2026-09-19).
| Case | Input | Expected | Fixed | Broken |
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The tests exercise event-selection logic using synthetic pointer records. They do not establish browser pointer capture, gesture arbitration or behaviour after a real pointer cancellation. A production handler still needs explicit release and cancellation paths so an interrupted drag cannot leave ownership permanently locked.