The debug API is a frozen read-and-drive surface exposed as <code>FasterMotion.debug</code>. It ships so humans, support, agents, and integration tests can inspect running pages.

Core read methods

• validate(): run live graph validation and return warning/error/info objects.
• validateFmtion(json): run static structural checks before loading.
• errors(): return recent runtime errors and drained runtime warnings.
• nodes(filter?): inspect node snapshots by type or id prefix.
• dump(): capture graph, backend, errors, scroll, pins, and node snapshots.

Surface-specific methods

• inspect(selector): map DOM elements to graph drivers and computed state.
• pins() and scroll(): inspect scroll and pin runtime state.
• sceneWires(): inspect cross-scene texture wires.
• textures(): inspect renderer texture stats.
• skinnedMeshes() and getDeformedVertices(pathId): inspect rigged/deformed render state.

Physics and drive methods

• Physics readers include physicsWorld(), physicsBody(id), physicsBodyIds(), physicsCollisionLog(), physicsBodyAt(x, y), physicsBodyGeometry(id), and physicsJoints().
• Physics diagnostic drive methods include physicsForceUnpause(), physicsRestorePause(), and physicsBodySetVelocity().
• scrollTo(target) mutates page scroll and resolves after graph evaluations settle.

Full method list

• errors, nodes, pins, inspect, smInternal, scroll, tick, dump, validate, validateFmtion, sceneWires, physicsWorld, physicsBody, physicsBodyIds, physicsCollisionLog, physicsBodyAt, physicsBodyGeometry, physicsJoints, physicsForceUnpause, physicsRestorePause, physicsBodySetVelocity, scrollTo, textures, skinnedMeshes, getDeformedVertices

Verified runnable examples

This guide points to proof-backed sample coverage. The full ledger lives in Generated examples and proof log.

DOM: Scroll fade reveal

• Source: faster-motion/demo/tests/dom/catalog/scroll-animations/fade-reveal/fade-reveal.domgraph.fmtion
• Expected output: Sections fade and translate into place as their trigger elements enter the configured viewport range.
• Validation: Schema validation passed. Runtime proof reports zero structural/runtime issues and 17 loaded nodes.
• Desktop proof: generated-assets/faster-motion-docs/proofs/screenshots/dom-fade-reveal-desktop.png
• Mobile proof: generated-assets/faster-motion-docs/proofs/screenshots/dom-fade-reveal-mobile.png

Canvas: Fill rule diagnostic

• Source: faster-motion/demo/tests/canvas/fillrule-diagnostic/fillrule-diagnostic.fmtion
• Expected output: A contained Canvas scene renders paired path cases so nonzero and evenodd fill handling can be compared visually.
• Validation: Schema validation passed. Runtime proof reports zero blocking runtime issues and 10 rendered objects; the accepted metadata note is preserved in the proof ledger.
• Desktop proof: generated-assets/faster-motion-docs/proofs/screenshots/canvas-fillrule-diagnostic-desktop.png
• Mobile proof: generated-assets/faster-motion-docs/proofs/screenshots/canvas-fillrule-diagnostic-mobile.png

Guide-specific sample target: Debug console sample that runs validate, nodes filter, inspect selector, sceneWires, textures, and one physics reader.

Faster Motion docs

Use this local map together with the left navigation. The source-backed content tree controls the main article order; this section keeps related pages one click away.

Start

• Faster Motion docs map
• Faster Motion documentation overview
• Get started with Faster Motion
• Faster Motion concepts
• .fmtion file format

DOM animation

• DOM animation guide
• DOM selectors and targets
• Scroll animation
• Pointer, hover, and drag inputs
• Text, SVG, and path animation
• Responsive gates and parameter overrides

Canvas animation

• Canvas animation guide
• Canvas area lifecycle
• Canvas objects, assets, and rendering
• Canvas inputs and state machines

3D and procedural

• Canvas 3D and procedural guide
• 3D scenes, cameras, and lights
• Procedural geometry and fields
• Particles and physics

Reference

• Node reference index
• Node categories reference
• Runtime loading and publishing
• Runtime API reference
• Debugging and preflight
• Debug API reference
• Validation errors and warning codes
• Faster Motion production checklist
• Faster Motion recipes overview