У вашего броузера проблема в совместимости с HTML5
Now with much of our IK system built, we're going to explore recreating an example of procedural animated dance. Its something I found a long while back when I first started to learn about ik. Its a pretty cool experiment done in unity that depends on its IK system and various other things that exists in the C# language. So we'll step though building a simple version purely with javascript and webgl. This is a fun example of building a semi complicated procedural animation.
In the second part, we're going to focus on moving the spine and the arms.
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Links of Interest
https://github.com/keijiro/PuppetTest
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GitHub :: https://github.com/sketchpunk/FunWithWebGL2
Patreon :: https://www.patreon.com/sketchpunk
Twitter :: https://twitter.com/SketchpunkLabs
Tumblr :: http://sketchpunklabs.tumblr.com/
Trello :: https://trello.com/b/zcTUPpFy/fun-with-webgl-20