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Re: Making pt a non-physical unit

From: Boris Zbarsky <bzbarsky@MIT.EDU>
Date: Thu, 07 Jan 2010 10:43:45 -0500
Message-ID: <4B460131.1070000@mit.edu>
To: Ambrose LI <ambrose.li@gmail.com>
CC: www-style@w3.org
On 1/7/10 10:38 AM, Ambrose LI wrote:
> I don't understand why we are stressing the importance of physical
> accuracy in projections. Do people expect units to measure as spec'd
> when projected?

I have no idea, but the spec says they should at the moment.  Just like 
it says they should measure as spec'd on an iPhone.  Or on an 
eye-glasses display.  Or a contact lens display.  That's what makes the 
physical units physical.

That's also what makes them clearly nonsense for anything where you 
don't control the device; 12pt font on a contact lens display would be 
... interesting.

> When we spec 12pt on PowerPoint does it result in 12pt type on the projection
> screen which looks like a tiny dot 15 ft away? No.

That's precisely how Webkit and IE treat pt in general and how Robert is 
proposing Gecko treat pt.  It's a clear violation of what the CSS spec 
says to do with pt at the moment.

-Boris
Received on Thursday, 7 January 2010 15:44:21 GMT

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