[whatwg] video background color (Was: Interpretation of video poster attribute)

[Philip Jägenstedt]

The issue with the poster attribute is resolved, but one comment made me
remember something I've wondered about:

On Fri, 2008-06-13 at 09:26 +0000, Ian Hickson wrote:

> It's not impossible; first black would render 300x150, then the poster 

The spec says: Areas of the element's playback area that do not contain
the video represent nothing.

What does this mean? Black is customary for video, but leaving the
region transparent (thus falling back to css background color) is
another option. Which is better?

-- 
Philip Jägenstedt
Opera Software