How do I set high score?

I've done exactly what was instructed in the tutorial here:http://youtu.be/06-LgQxceGg

However, it doesn't update the value. If I try to refresh the browser preview, it still doesn't update.

Another question, will the WebStorage function work for mobile games (Android and iOS)?

when you refresh the browser it will star back to 0, I learned to export and test in XDK. its much better and I can test in on different devices.