У вашего броузера проблема в совместимости с HTML5
Instructions on how to measure your Ankle to Knee (ATK) to size Hockey goalie pads.
Detailed Leg pad Buyer's guide -- http://www.thehockeyresource.ca/hockey-resources/equipment/goalie-gear/Leg-Pads-Buyer-s-Guide
ATK is used to estimate what size of pads would fit you. However each manufacturer makes their pads slightly different. There is no universal law ATK X = pad size Y rather it is just a way to compare. While I think this is not the best way to purchase pads, in some situations (buying online) it is the only way to know if it will fit or not.
I will try and make an ATK - Pad size reference chart with your help! Please post your ATK and current pad model/size in the comments and I will build this all up into a reference chart for others to use.
http://www.thehockeyresource.ca