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Re: Making pt a non-physical unit

From: Thomas Phinney <tphinney@cal.berkeley.edu>
Date: Tue, 5 Jan 2010 15:33:43 -0800
Message-ID: <f49ae6ac1001051533m3ac62ba5kbc495df0e3acc8c5@mail.gmail.com>
To: robert@ocallahan.org
Cc: www-style <www-style@w3.org>
On Tue, Jan 5, 2010 at 3:24 PM, Robert O'Callahan <robert@ocallahan.org>wrote:

> On Wed, Jan 6, 2010 at 12:05 AM, Robert O'Callahan <robert@ocallahan.org>wrote:
>> My understanding from a conversation I had on #webkit is that Webkit
>> avoids the problem by treating 1pt as 4/3px regardless of the display DPI. I
>> think we probably need to do this in Gecko for Web compatibility reasons,
>> and so for the sake of honesty in Web specifications, I propose that the
>> definition of pt in CSS be altered accordingly.
>> (At this time, I don't think we need to give up on physical units
>> entirely; all the problematic sites I'm aware of are misusing pt, but not mm
>> or in. mm remains useful for specifying the dimensions of touch-based
>> interfaces.)
> One additional question is what to do with picas. I propose keeping picas
> at 12 points, i.e., fixing them at 16 CSS pixels, i.e., making them no
> longer be a physical unit. I'm not aware of any Web content using picas at
> all, so we could leave them as physical units, but that might be
> unnecessarily confusing.

it's definitely worth keeping the pica/pt relationship if possible.

Received on Tuesday, 5 January 2010 23:34:16 UTC

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