How to enable full screen mode for the browser without expanding it to full screen?

Question

Browsers

Hello.
A page with a map of a certain region is displayed on a separate monitor to monitor changes. All the necessary information does not fit due to the presence of several sites in different cities. It is necessary to display maps of different cities on one monitor. It's like a security post monitor with 4 separate cameras, only in relation to a regular page on the Internet.
What I wanted to do first was to open 4 separate browser windows and position each one in its own corner. But then there is a problem with the display, as the browser interface eats up a lot of space. Switching to full screen mode expands the window to the entire monitor and the remaining areas are not visible. I did not find a browser that can hide the entire interface without switching to full-screen mode.
Next, I dug in the direction of dividing one physical monitor into 4 virtual ones, so that full-screen deployment occurs in its allocated corner of the physical monitor. And again I did not find a solution.
Someone solved a similar problem?

Answer 1

How I see the solution to this problem from the bell tower of a web developer.
- We make a separate page, where we insert 4 pages you need through the iframe and that's it.
An example with multi twitch, watching multiple streams in one window. www.multitwitch.tv/starladder1/starladder3/starlad...