javascript - AS3 - physical size of the desktop screen -

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i want show ruler in web page has exact size ruler in real world (with cm, inches, etc). i'm tried determine real dpi or physical size of screen in web browser, impossible.

is there way as3 or different way in browser?

if available, screen dpi available, using as3, in :

flash.system.capabilities.screendpi

it should available of time.


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