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Checkpoint web parity through Chromium input tasks
2026-08-19 10:39:03 -04:00

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M14-04C Status

status: done
task: Chromium mouse/touch/pen pointer identity and cancellation contract
updated: 2026-08-19 America/New_York
enablingTask: false
parityStateChange: false

Scope

The main-thread and Offscreen viewport paths now record a shared pointer observation for mouse, touch, and pen input. Pointer identity, pressure, tilt, button/buttons and pointercancel are preserved with bounded values; unknown pointer types and invalid IDs fail closed. Chromium production events verified down/cancel pairs for all three pointer types. Firefox/WebKit are excluded.

Evidence

  • npm --prefix web run build passed.
  • npm --prefix web run test:chromium-pointer-contract passed: 2 protocol tests and real Chromium mouse/touch/pen down/cancel events.
  • Checker output: chromium-pointer-ok types=mouse,touch,pen cancel=PASS execution=DISABLED next=M14-04D.
  • npm --prefix web run typecheck and git diff --check passed.

Next Task

M14-04D: Chromium IME composition guard for incomplete operators.