javascript - How can you detect when a call to window `focus()` will not be available?

Question

Some browsers, particularly on mobile, disable the window focus() functionality for existing windows. Can you detect when this will happen, without browser sniffing? By using feature detection?

My problem is that I have a button that executes

popup.focus();

If this function won't do anything, I want to hide the button. I can do that by checking screen size or browser sniffing but I would like a more elegant and robust solution.

question from:https://stackoverflow.com/questions/65942214/how-can-you-detect-when-a-call-to-window-focus-will-not-be-available

Answer 1

Waitting for answers