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

Test: ../../../../resources/webgl_test_files/deqp/functional/gles3/builtinprecision/length.html
[ 1: FAIL ] precision.length.lowp_vertex.scalar: bindBuffer
[ 2: FAIL ] precision.length.lowp_vertex.vec2: bindBuffer
[ 3: FAIL ] precision.length.lowp_vertex.vec3: bindBuffer
[ 4: FAIL ] precision.length.lowp_vertex.vec4: bindBuffer
[ 5: PASS ] precision.length.lowp_fragment.scalar: All 16404 inputs passed.
[ 6: PASS ] precision.length.lowp_fragment.vec2: All 16404 inputs passed.
[ 7: PASS ] precision.length.lowp_fragment.vec3: All 16404 inputs passed.
[ 8: PASS ] precision.length.lowp_fragment.vec4: All 16404 inputs passed.
[ 9: FAIL ] precision.length.mediump_vertex.scalar: bindBuffer
[ 10: FAIL ] precision.length.mediump_vertex.vec2: bindBuffer
[ 11: FAIL ] precision.length.mediump_vertex.vec3: bindBuffer
[ 12: FAIL ] precision.length.mediump_vertex.vec4: bindBuffer
[ 13: FAIL ] precision.length.mediump_fragment.scalar: 14151/16404 inputs failed.
[ 14: FAIL ] precision.length.mediump_fragment.vec2: 15652/16404 inputs failed.
[ 15: FAIL ] precision.length.mediump_fragment.vec3: 15632/16404 inputs failed.
[ 16: FAIL ] precision.length.mediump_fragment.vec4: 15398/16404 inputs failed.
[ 17: FAIL ] precision.length.highp_vertex.scalar: bindBuffer
[ 18: FAIL ] precision.length.highp_vertex.vec2: bindBuffer
[ 19: FAIL ] precision.length.highp_vertex.vec3: bindBuffer
[ 20: FAIL ] precision.length.highp_vertex.vec4: bindBuffer
[ 21: FAIL ] precision.length.highp_fragment.scalar: 13722/16404 inputs failed.
[ 22: FAIL ] precision.length.highp_fragment.vec2: 14723/16404 inputs failed.
[ 23: FAIL ] precision.length.highp_fragment.vec3: 14226/16404 inputs failed.
[ 24: FAIL ] precision.length.highp_fragment.vec4: 13559/16404 inputs failed.
[ 25: PASS ] precision.length.highp_fragment.vec4: successfullyParsed is true
[ FAIL ] 20 failures reported