TIL - Chrome has emulate focused page

Today I learned that chrome has Emulate Focused Page settings.

What such toggle is doing?

It emulates that the page is focused and allows to debug select or dropdown that is triggered when user focus input.

You can see screenshot below:

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Focused page

You can find this setting under Rendering/Emulate Focused Page inside chrome devtools. Rendering tab can be accessed by CMD+SHIFT+P and typing Rendering.