This test runs the WebGL Test listed below in an iframe and reports PASS or FAIL.

Test: ../../resources/webgl_test_files/conformance/context/context-no-alpha-fbo-with-alpha.html
[ 1: PASS ] gl = getWebGL({ alpha: false, antialias: false }) is non-null.
[ 2: FAIL ] Alpha channel of clearColor should be ignored at (0, 0) expected: 0,0,0,255 was 0,0,0,179
[ 3: PASS ] Alpha channel of clearColor should be obeyed for FBO with alpha channel
[ 4: FAIL ] Alpha channel of back buffer should still be 255 at (0, 0) expected: 0,0,0,255 was 0,0,0,0
[ 5: PASS ] successfullyParsed is true
[ FAIL ] 2 failures reported