How do I get DPI of device?

Hi guys, I try to add AdMob smart banner to my app, but I need to know screen resolution in dp (independet-pixel density). So I need to know DPI of user's screen.

There is cocoonIO plugin with this expression, but it's not working. How can I do that? Thanks for any help.

The browser object's devicepixelratio expression gives you the ratio - the DPI typically refers to dots per inch, which is not usually as useful.

Thank you Ashley, that's help a lot.

Does it also work when the game is turned into an app for android or iOS ?

Yes - almost all features work identically across all platforms.