If you are looking to develop responsive web pages for your web application which that look good on desktops, tablets, and mobile phones

 Twitter bootstrap is the ideal solution. It has the built in HTML5 CSS3 and JavaScript code

This framework is 940px-width, 12 columns grid system where you can lay your UI elements easily. This grid system has four variations for different browser types of different devices. These days you can find various sizes of devices which people use to browse the web

Reusable components are built into Bootstrap to provide navigation, alerts, popovers

Now with 12 custom jQuery plugins you can do lot …