workinf_Blender_Wasm/docs/status/M14-04B.md

M14-04B Status

status: done
task: Chromium DPR 1/1.5/2/3 canvas and raycast consistency
updated: 2026-08-19 America/New_York
enablingTask: false
parityStateChange: false

Scope

Shared viewport DPR and CSS-bounds NDC helpers now drive the main-thread and Offscreen viewport boundaries. Chromium production verification ran at device scale factors 1, 1.5, 2 and 3; the declared renderer cap of 2 was applied, backing dimensions matched the browser canvas, CSS dimensions remained 679x321, and the same center raycast selected the same object at every scale.

Evidence

• npm --prefix web run build passed.
• npm --prefix web run test:chromium-dpr-consistency passed: 2 protocol tests and 4 real Chromium production contexts.
• Checker output: chromium-dpr-ok dpr=1,1.5,2,3 css=679x321 selection=stable execution=DISABLED next=M14-04C.
• npm --prefix web run typecheck and git diff --check passed.

Next Task

M14-04C: Chromium mouse/touch/pen pointer identity and cancellation contract.