§62's list is WebGPU, WebGL 2, Canvas 2D, SVG, and a headless/software tier;
"null" is this package's name for that last tier — see NullRenderer.
A string rather than an enum so it serializes, logs, and compares as itself
(§7a house style, matching TransformAuthority and DepthRange).
Which backend an implementation drives (§62).
§62's list is WebGPU, WebGL 2, Canvas 2D, SVG, and a headless/software tier;
"null"is this package's name for that last tier — see NullRenderer. A string rather than an enum so it serializes, logs, and compares as itself (§7a house style, matchingTransformAuthorityandDepthRange).