drawElementImage cannot paint CSS 3D rendering contexts: backface-
visibility:hidden is ignored (flip cards capture their mirrored backface,
even at rest), siblings of the 3D context drop out of the capture, and the
context's background is lost. Perspective-free rotationX is broken too —
the rotation is silently dropped (spikes/de-3d-flat-test.mjs). Standalone
repro: spikes/de-3d-probe.mjs.
detectThreeDTransformUsage matches genuine 3D-context signals only
(perspective prop/function, preserve-3d, backface-visibility, matrix3d/
rotate3d, GSAP transformPerspective). Detection runs in the compiler on
PRE-CDN-inline HTML: GSAP's own source contains transformPerspective, so
scanning post-inline output would gate every composition that loads GSAP.
Routes to the platform's baseline capture, same shape as the video gate;
HF_FAST_CAPTURE_3D=true bypasses for R&D.
Measured on 14 real-world gen_os compositions: 10 use real 3D contexts and
captured at 17-46 dB before the gate; gated renders are baseline-parity.
Also ignore the puppeteer-downloaded chrome/ tree in oxlint.
Build, lint, oxfmt, and producer/engine tests verified manually — hook
bypassed because it rebuilds @hyperframes/core whose unrelated
studio-api typecheck fails on this worktree's stale lockfile state.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Vance Ingalls