The controls
attribute takes no values- it should be used like this instead:
<video class="yadda" width="100%" controls>....</video>
The controls will appear on the bottom of the video, with standard icons. Unfortunately, the video controls are also not customizable. If you want them at the top, you will have to create your own custom interface.
Information from http://www.w3.org/TR/2008/WD-html5-20080122/#controls