What the Virtual Viewport?
The virtual viewport in Chrome 40 will allow you the ability to scroll elements on the page that were set as
position:fixed;
— for instance elements like the top Nav bar of
When mobile browsers started out, the lack of a viewport meta tag meant they would make the web page think it had approximately 980px of screen real estate and render at this size. With a viewport meta tag, developers could define the width, most common of which is “device-width”, which sets the screen size to that of the device. You can learn more on Web Fundamentals.
An excerpt from What the Virtual Viewport?
