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

Test: ../../../resources/webgl_test_files/deqp/functional/gles3/fbostencilbuffer.html
[ 1: PASS ] stencil.basic.depth32f_stencil8:
[ 2: FAIL ] stencil.basic.depth32f_stencil8_depth: Framebuffer Status: FRAMEBUFFER_UNSUPPORTED
[ 3: PASS ] stencil.basic.depth24_stencil8:
[ 4: FAIL ] stencil.basic.depth24_stencil8_depth: Framebuffer Status: FRAMEBUFFER_UNSUPPORTED
[ 5: PASS ] stencil.basic.stencil_index8:
[ 6: PASS ] stencil.attach.depth_only:
[ 7: PASS ] stencil.attach.stencil_only:
[ 8: FAIL ] stencil.attach.depth_stencil_separate: Framebuffer Status: FRAMEBUFFER_UNSUPPORTED
[ 9: PASS ] stencil.attach.depth_stencil_attachment:
[ 10: PASS ] stencil.attach.depth_stencil_attachment: successfullyParsed is true
[ FAIL ] 3 failures reported