Another possible platform for delivery is jsdoit.

For instance, the racing widget is embedded at:
http://jsdo.it/widged/6jZd
or in full screen at:
http://jsdo.it/widged/6jZd/fullscreen
and the running version
http://jsrun.it/widged/6jZd

Embedded into wikispaces
<iframe scrolling="no" src="http://jsrun.it/widged/6jZd" width="465" height="546" style="border:1px #CCC solid; width: 465px; margin: 0px;"></iframe>

racing game - jsdo.it - share JavaScript, HTML5 and CSS



It is also possible to embed it as a forkable activity, playable only on demand.
<iframe scrolling="no" src="http://jsdo.it/blogparts/6jZd?view=design" width="465" height="546" style="border:1px #CCC solid; width: 465px; margin: 0px;"></iframe>
 



or the forkable code


racing game - jsdo.it - share JavaScript, HTML5 and CSS