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Renderer support matrix

This matrix summarizes current backend support status by feature class.

Status:

pass - implemented
partial - implemented with known limits
todo - planned/not implemented

Feature class	Canvas	Terminal	WebGPU (MVP)
Tree/layout render integration	`pass`	`pass`	`pass`
Solid box backgrounds	`pass`	`pass`	`pass`
Text paint	`pass`	`pass`	`todo`
Selection highlight	`pass`	`todo`	`todo`
Focus ring/debug overlays	`pass`	`todo`	`todo`
Gradients/shadows/radius parity	`pass`	`partial`	`todo`
Direction baseline (`dir`) support	`pass`	`partial`	`partial`

Notes

WebGPU is intentionally scoped as an MVP backend in 1.3; see RENDER_TARGET_STRATEGY_1_3.md.
Renderer-agnostic semantic/accessibility fixture coverage remains in packages/core/src/__tests__/renderer-agnostic-fixture.test.ts.