I was wondering what is native resolution for browsers such as IE, Firefox or Chrome?

The reason asking is since I have hooked up PC to my TV (720p), the resolution setting 1360x768 will completely fill TV screen horizontally without the need for scrolling from left to right to see the whole web pages.

Now, if we have a 1080p TV and set the PC resolution to 1920x1080 which make web pages look smaller, will the browser still fill the whole screen. Or are we going to have side bars?

Inquiry minds wants to know