incomplete

Explicit WebGPU Fallback Teaching Harness

This report separates published implementation state from accepted evidence. Every value below comes from the schema-v2 registry, the emitted source manifest, or promoted same-lab artifacts.

Open demo Owning skill Published source manifest Registry JSON Canonical source

Lab id: browser-fallback-harness
Kind: Canonical Lab
Owning skill: Three.js Compatibility Fallbacks
Execution: rendering
Three.js: 0.185.1
Source hash: sha256:434be6d369e5ecdaa1b4c5ba763f7d946aeb7b0f7ea993b30eacec531a8ef79c
Published bundle hash: sha256:7de5ce837afa37160aee5d24c82d0a6844d35e2c687dee9227027c4e630c2785
Build revision: sha256:6c7881ab73865696d689489de465e1cd67e1f2242d43641279abac777df0479b
Renderer: Not promoted
Backend: Not promoted
Evidence contract: v2
Tracked release bundle: Absent

Claim verdicts

canonicalAcceptanceINSUFFICIENT_EVIDENCE

hardwarePerformanceNOT_CLAIMED

Promoted same-lab media

No same-lab evidence image is promoted for this report. The page intentionally shows status and proof requirements instead of substitute art.

Required capability and runtime proof

Capabilities

tested-webgpu-unavailableincomplete

The source gate is implemented; a live no-WebGPU browser capture remains required before acceptance.

explicit-user-requestincomplete

Compatibility branch construction is gated on explicit request authorization.

Runtime proof

default-blockeraccepted

Unit fixtures prove the default result blocks without an explicit request.

live-backend-probeincomplete

A live browser probe must establish the unavailable-WebGPU condition before branch construction.

one-degradation-axisaccepted

Fixture validation enforces exactly one changed degradation axis per ordered decision step.

independent-loss-and-timingaccepted

Visible loss and CPU-fixture timing have independent provenance; GPU timing remains insufficient without timestamps.

isolated-force-webgl-branchincomplete

The forceWebGL module is lazily imported only after explicit authorization and unavailable-WebGPU proof.

Capture state

Field	Published value
Primary route	`/demos/browser-fallback-harness/`
Cameras	`comparison`
Seeds	`0x00000000`
Modes	`plan`
Capture time	`Not present in the promoted report data`
Adapter identity	`Not promoted`
Raw readback hashes	`Not promoted`

Fixed routes

Kind	Id	Startup state	Status
scenario	`blocked-default`	`{"scenario":"blocked-default"}`	incomplete
scenario	`native-budget-reduction`	`{"scenario":"native-budget-reduction"}`	incomplete
scenario	`precomputed-static`	`{"scenario":"precomputed-static"}`	incomplete
scenario	`cpu-offline`	`{"scenario":"cpu-offline"}`	incomplete
scenario	`feature-removed`	`{"scenario":"feature-removed"}`	incomplete
scenario	`maintained-legacy`	`{"scenario":"maintained-legacy"}`	incomplete
scenario	`invariant-loss-comparison`	`{"scenario":"invariant-loss-comparison"}`	incomplete
mechanism	`explicit-activation-gate`	`{"scenario":"blocked-default"}`	incomplete
mechanism	`ordered-degradation-trace`	`{"scenario":"maintained-legacy"}`	incomplete
mechanism	`bounded-water-loss-oracle`	`{"scenario":"invariant-loss-comparison"}`	incomplete
mechanism	`invariant-ledger`	`{"scenario":"invariant-loss-comparison"}`	incomplete
mechanism	`force-webgl-branch-isolation`	`{"scenario":"maintained-legacy"}`	incomplete
mechanism	`maintenance-acceptance`	`{"scenario":"maintained-legacy"}`	incomplete

Locked tier contracts

No renderer quality tiers apply to this primary.

Limitations

No tracked accepted v2 runtime bundle is published for this source hash.
2 required capability records remain incomplete.
2 required runtime-proof records remain incomplete.
No current-hardware performance claim is published without named-adapter timestamp evidence.