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

Test: ../../resources/webgl_test_files/conformance2/transform_feedback/two-unreferenced-varyings.html
[ 1: PASS ] WebGL context exists
[ 2: PASS ] getError was expected value: NO_ERROR : Init transform feedback should succeed
[ 3: PASS ] getError was expected value: NO_ERROR : Draw with transform feedback should succeed
[ 4: FAIL ] buffer should match expected values
[ 5: PASS ] successfullyParsed is true
[ FAIL ] 1 failures reported