Known failures in the WebGL CTS, top of tree, using Chromium
https://www.khronos.org/registry/webgl/sdk/tests/webgl-conformance-tests.html

conformance/glsl/bugs/compound-assignment-type-combination.html: 54 tests failed
conformance/glsl/misc/struct-equals.html: 3 tests failed
conformance/glsl/misc/struct-specifiers-in-uniforms.html: 12 tests failed
conformance/glsl/misc/ternary-operators-in-global-initializers.html: 12 tests failed
conformance/textures/tex-image-and-sub-image-2d-with-webgl-canvas.html: 32 tests failed
conformance/textures/tex-image-and-sub-image-2d-with-webgl-canvas-rgb565.html: 64 tests failed
conformance/textures/tex-image-and-sub-image-2d-with-webgl-canvas-rgba4444.html: 64 tests failed
conformance/textures/tex-image-and-sub-image-2d-with-webgl-canvas-rgba5551.html: 64 tests failed
