Putting tab in the background

[Mor Amrani]

Hello devtools community,

I'm looking for a way to put an existing tab in the background, in order to simulate something like "tab switching" made by the user.

Is there a way to put a tab in the background using CDP? These are the available options I spotted so far, but none of them does exactly what I'm looking for:

• Emulation.setFocusEmulationEnabled - Can only turn the tab state to 'visible', but not to the opposite hidden/invisible/background state.
• Page.setWebLifecycleState - Unfortunately, the allowed values for it are 'active' or 'frozen', and there is no option for 'hidden', to simulate a tab that was moved to the background.
• Target.createTarget({background: true}) - Obviously is useful only when creating new targets, and I look for something to use on existing targets.

Thanks!

Mor

[Alex Rudenko]

Hi Mor,

I believe using Page.bringToFront is the closest method to emulate "tab switching" by the user. It allows bringing another tab in the foreground which brings other tabs into the background.

Best regards,
Alex

P.S. I have just sent another reply but it looks like it got lost somewhere (in case you receive duplicate emails from me).

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[Mor Amrani]

Thanks Alex for the quick answer!

This can be very useful for me, but I tried using Page.bringToFront()while having 2 tabs running on the same context browser, and it looks like the two of them still visible. I checked with document.visibilityState which returns 'visible', and also I see that the CPU consumption wasn't reduced and looks like both tabs are still being rendered. Am I missing something?

In addition, I wonder if there's an option to simulate a situation when all the tabs are in the background? Let's say the user have moved to other application, and left the whole browser in the background.

Thanks a lot,

Mor

[Alex Rudenko]

Hi Mora,

they should not be both visible if that are in the same window because the browser UI does not allow that (but you should not use the old headless mode which has the custom implementation for visibility and pretends all tabs are visible).
You can use https://chromedevtools.github.io/devtools-protocol/tot/Browser/#method-setWindowBounds for minimizing/maximizing the browser window. 

Best regards,
Alex