The Chrome OS Virtual Keyboard contains almost all the keys found on the physical Chrome OS keyboard in the last Dev Update.

It means I can reduce the brightness of my screen or toggle the overview mode by tapping on the corresponding system keys on the Virtual Keyboard. All of them are not yet functional though since the chromium team is still working on it.

If you want to play with it, you'll have to enable the chrome://flags/#enable-virtual-keyboard flag first and focus a password field for now like I did below.

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