Text-shaping seam: measure/shape text into advances over a swappable backend (canvas default, HarfBuzz future)

Registry tables — persistent keyed/slot/ordinal registries with explicit omission

Application and window host layer bridging platform events to the scene graph

Renderer-agnostic text layout engine: measures and positions glyphs into layout groups

Render-effect intents and substrate-agnostic recipe math

Vector path geometry: curve flattening and tessellation of GraphicsPath outlines

Texture atlases: regions, grid slicing, UVs, and constructors over image resources

Font and font-resource types and constructors

DOM-free image decode/encode seam: MIME-keyed decoder/encoder registry over swappable per-format backends

2D and 3D cameras: projection, view, and view-projection helpers

Renderer registration, render state, render queue, and backend draw contracts

HTTP(S) transport (URLLoader/URLRequest) over a swappable web/native backend (fetch by default)

2D skeleton: bone hierarchy with 2D affine transforms, world propagation, inverse-bind, and weighted CPU mesh deformation (Spine/DragonBones model)

Text display objects: single-format TextLabel and multi-format RichText built on the text-layout spine

Spritesheet frame animation playback

Video resources and URL constructors

Timeline-based animation sequencing

3D scene graph and spatial node hierarchy

Tween animation system with easing functions

Particle system: emitter simulation and typed-array-backed particle primitives