Today's multi-device, multi-browser, multi-screen size audiences mean web pages and content need to respond to display clearly and efficiently. From desktop to mobile device content and layout changes to best fit the view.
The huge growth in mobile device web browsing means web pages have to respond to the mobile screen sizes and orientations to look their best.
...down there in the right hand corner, and watch the page adapt and the content respond to the change of width - dynamically!
The content will reposition, the images will resize, and the layout will reflow to stay clear and legible right down to mobile browser widths.