Google Chrome lacks native split-screen functionality, but workarounds include extensions, OS-level functionality, and resizing tabs manually.

Google has been working on implementing a tablet mode split screen feature into Chromebooks for some time and the functionality now appears to have been pushed to the first stable builds of Chrome ...

But using Chrome OS in tablet mode is still rough around the edges. Now Google is trying to change that, with the introduction of split-screen windows in tablet mode.