Known failures in the WebGL CTS 1.0.4, ToT ANGLE (Debug/x64), using Canary
https://www.khronos.org/registry/webgl/sdk/tests/webgl-conformance-tests.html

conformance/glsl/bugs/pow-of-small-constant-in-user-defined-function.html: 1 tests failed
conformance/glsl/bugs/sampler-struct-function-arg.html: 1 tests failed
conformance/glsl/misc/const-variable-initialization.html: 27 tests failed
conformance/misc/expando-loss.html: 4 tests failed
deqp/data/gles2/shaders/constants.html: 34 tests failed
deqp/data/gles2/shaders/functions.html: 8 tests failed
deqp/data/gles2/shaders/linkage.html: 2 tests failed
deqp/data/gles2/shaders/preprocessor.html: 109 tests failed
deqp/data/gles2/shaders/scoping.html: 4 tests failed
