Content inside the 'video' element is not shown to the user (image).
Test Result Test Assertion
Manual Test fails if red appears anywhere on the page.

http://www.w3.org/TR/html5/video.html#video

Content may be provided inside the video element. User agents should not 
show this content to the user; it is intended for older Web browsers 
which do not support video, so that legacy video plugins can be tried, 
or to show text to the users of these older browsers informing them of 
how to access the video contents.