Chrome Version: 66.0.3329.0
OS: CrOS

What steps will reproduce the problem?
(1) Maximize window with many tabs
(2) Put mouse in top row of pixels on screen over background tab
(3) click

What is the expected result?

background tab is selected

What happens instead?

background tab is not selected

Please use labels and text to provide additional information.

Assigning to rpop@ at tom's recommendation

For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.