Trigger Rally
https://triggerrally.com
I just thought I would share this as its better looking than a PS1 game and its working through a web browser! Current state of the WebGL development is looking good. Check out the landscape by driving off the edge of the cliff.
I got 17.47 seconds by the way
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If you would like to know more about Unity 5 & Unreal 4 HTML5 and WebGL then there are more examples over on this thread.
http://www.polycount.com/forum/showthread.php?t=151611
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It's kind of addicting.