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

Test: ../../resources/webgl_test_files/conformance/context/user-defined-properties-on-context.html
[ 1: PASS ] WebGL context exists
[ 2: FAIL ] gl2.myProperty should be 2 (of type number). Was undefined (of type undefined).
[ 3: PASS ] successfullyParsed is true
[ FAIL ] 1 failures reported