У вашего броузера проблема в совместимости с HTML5
To get an accurate reading, it’s important to take your blood pressure correctly. One of the most important factors in taking accurate blood pressure is having a proper fitting cuff. Once you have the right cuff size, find a quiet environment and rest for 15 minutes. Sit in a chair with your feet flat on the floor and your back straight. Rest your arm on the table with your palm facing upward.