Test 'controls' attribute

TEST(video.controls) OK
EVENT(load)
TEST(video.controls) OK
RUN(video.removeAttribute('controls'))
TEST(!video.controls) OK
RUN(video.controls = true)
TEST(video.getAttribute('controls') == 'controls') OK
RUN(video.controls = false)
TEST(!video.getAttribute('controls')) OK
RUN(video.setAttribute('controls','controls'))
TEST(video.controls) OK
END OF TEST