The two places I know where they are the furthest ahead in certain respects are the U.S. for certain and, in some areas, the state of Israel. We haven't surveyed all around the world to be in a position to give you a comprehensive review, but I know that Israel puts in stronger requirements than Ontario does. They have more enforcement officials for accessibility in the tiny state of Israel, with a few other problems on their plate, than in the entire province of Ontario.
On October 25th, 2018. See this statement in context.