You controls do not work in Firefox 34 or Chrome 39 or Iron 38 or Opera 26.
You show the errors and can trace a Javascript in Developertools with Ctrl Shift I.
JS in Opera 12:
http://www.opera.com/docs/specs/presto2.12/
JS in Opera 26 (is like Chromium):
http://www.ecma-international.org/ecma-262/5.1/
https://developers.google.com/v8/