Worked on enhancing PointerEvent web platform test coverage in the mozilla/gecko-dev repository, focusing on improving reliability and robustness for touch and pen input scenarios. Expanded four existing tests to include comprehensive coverage for these input types, refined the placement of touch-action:none styles, and strengthened test flows to handle repeated setPointerCapture calls without introducing flakiness. Added a regression test to verify that failed setPointerCapture calls with invalid pointer IDs do not interfere with ongoing captures. Utilized JavaScript, HTML, and the Pointer Events API to ensure more reliable automated testing and reduce the risk of regressions during continuous integration workflows.