webgl/1.0.4/conformance/extensions/ext-color-buffer-half-float.html fails
https://www.khronos.org/registry/webgl/sdk/tests/conformance/extensions/oes-texture-half-float.html?webglVersion=1&quiet=0&quick=1 Passes in browser, fails in tests?
At least macOS 11.3, iMacPro1,1, Radeon Pro Vega 56
<rdar://problem/75772499>