У вашего броузера проблема в совместимости с HTML5
Experimenting with making a wooden ring (to wear on your finger)
Using my router pantograph
http://woodgears.ca/pantograph/rings.html
More about the pantograph here:
http://woodgears.ca/pantograph
More about the pantograph:
http://woodgears.ca/pantograph
Please note: I already have a lathe, but I used this method because its faster.