Equestrian made its Summer Olympics debut at the 1900 Summer Olympics in Paris, France. At the 1900 Summer Olympics, five equestrian events were contested. Only three are currently considered Olympic by the International Olympic Committee including "Dressage".Dressage had changed dramatically since the 1912 Olympics. The dressage horse no longer has to jump, but the test on the flat has become increasingly difficult, emphasizing the piaffe and the passage. The 1912 Stockholm Olympics held the first Olympic dressage competition, featuring 21 riders from 8 countries (Belgium, Denmark, France, Germany, Norway, Russia, Sweden, and the United States). Dressage horses were required to perform 3 tests: a test on the flat, a jumping test, and an obedience test. All dressage horses were required to jump 4 obstacles which were a maximum of 1.1 meters high, and another fence with a 3 meter spread. They were then asked to perform an "obedience test," riding the horse near spooky objects. Riders were required to wear informal uniform if they were military officers, or black or pink coats with silk hats if they were civilians. Horses had to be ridden in a double bridle, and martingales and bearing reins were prohibited.