UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36

Steps to reproduce the problem:
It would be perfect if we could create a popup that stays on top of other windows. Linux users have this option natively by just right-clicking the popup title and Windows users can use 3rd-party softwares such as Deskpins or AutoHotkey, whereas macOS and Chrome OS users lack this feature.

chrome.windows.create({
    url: 'https://translate.google.com/m/translate',
    width: 350,
    height: 400,
    type: 'popup',
    alwaysOnTop: true // <-- This would be the new option
});

It is important to note that this has nothing to do with "panels" (type: 'panels'), that are long gone.

This feature is essential for taking notes, watching videos, watching live broadcasts, translating texts, chatting, calculating, and many other things.

What is the expected behavior?

What went wrong?
-

Did this work before? No 

Does this work in other browsers? N/A

Chrome version: 65.0.3325.162  Channel: stable
OS Version: 16.04
Flash Version: