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

Test: ../../resources/webgl_test_files/conformance2/transform_feedback/unwritten-output-defaults-to-zero.html
[ 1: PASS ] WebGL context exists
[ 2: PASS ] getError was expected value: NO_ERROR : Set up program should succeed
[ 3: FAIL ] buffer should match expected values
[ 4: PASS ] getError was expected value: NO_ERROR : Set up program should succeed
[ 5: PASS ] buffer should match expected values
[ 6: PASS ] successfullyParsed is true
[ FAIL ] 1 failures reported