javascript - Get Pixel height of Centimetre unit CSS -

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we're writing our own web app , need user have (fairly) accurate visualisation of printed documents on-screen. i'm using centimetre unit in css try , replicate a4 page.

i need work out actual pixel height assigned following:

max-height: 27cm;

is possible in javascript? need pixel height because need compare offsetheight max-height.

well, due screens of differing size, resolution, , ppi, wouldn't possible display real life sized view of page consistent across screens. not unless find size of pixels themselves, not believe possible via js.


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