webgl/2.0.1/conformance2/context/constants-and-properties-2.html fails
https://www.khronos.org/registry/webgl/sdk/tests/conformance2/context/constants-and-properties-2.html?webglVersion=2&quiet=0&quick=1 This test ensures that the WebGL context has all the constants and (non-function) properties in the specification. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". Canvas.getContext PASS All WebGL constants found to have correct values. PASS All constants removed from WebGL spec were absent from WebGL context. FAIL Also found the following extra properties: FAIL STENCIL_INDEX PASS successfullyParsed is true TEST COMPLETE
At least macOS 11.3, iMacPro1,1, Radeon Pro Vega 56
<rdar://problem/75774178>