У вашего броузера проблема в совместимости с HTML5
Quick examination & test of the sub $300 CT-312 multi function welder
I purchased this on-line for use in a budget home brew CNC plasma cutter.
So far it looks like it ill do the job!
Nice to see all the discrete electronics so should be not to difficult to fix in the case of failure down the road.
May even do a Tig/Arc test further down the track when I get some electrodes & Gas.
Stay tuned for more :)