У вашего броузера проблема в совместимости с HTML5
2 men operating one skill saw with both our faces inches from the blade with LOTS of sparks....80 foot cut 4 abrasive blades used up. One of us lifted the saw and guided it while the other pulled the triger and pushed. I had nomex flight gloves on both hands and a heavy welding glove on the hand lifting the saw. It was so hot I was afraid it was going to ignite the magnisium sawdust/spark guard.