Hi..

I started my career as a UI developer.. My 1st task is too make HTML5 to work in all browser especially IE family... But i heard HTML5 wont support mostly in IE.. My question is...

how to Make HTML5 work in old versions of Internet Explorer ??
What are roles and responsibilities of UI developer??
What are language i have to learn except jquery, css3 and html5 to shine as UI developer ??