What I find amusing about the admonition to use points is that points  
are printing-industry-based, not monitor- or Web-based. There are 12  
points in a pica, or 72 points in an inch. Back in the day, one pica  
was .166 of an inch; now it is 1.6 of an inch. But we don't use inches  
or picas when discussing the web.

I'm aware of the discussions about using point sizes on the web, so  
I'm not opening that discussion.

An em is another issue. On the surface, an em is a unit of measurement  
that uses the width of the capital "M" in a font. An en is a unit of  
measurement that uses the capital "N" of a font. Except with many  
fonts nowadays, there may be no capital M's or N's, or the caps (or  
rest of the letters) are a weird height or width. With CSS3 gaining  
support, and therefore font-embedding, this will be an issue. I used  
to be able to take an "E" Gauge (a type size gauge), find the cap  
height of a capital "E," and then be able to tell what the font size  
was. Not so much anymore.

http://en.wikipedia.org/wiki/Pica_(unit_of_measure)
http://desktoppub.about.com/cs/intermediate/a/picaspoints.htm

Don't even get me started on leading.

Theresa (graphic designer - and old-time typesetter - for 38 years now)


On Aug 10, 2009, at 3:50 PM, Michael Stevens wrote:

> -----Original Message-----
> From: hramr...@gmail.com [mailto:hramr...@gmail.com] On Behalf Of  
> Michal
> Suchanek
>
>> The problem is that the physical size is what the user sees, not  
>> the pixel
> resolution. That's why it's better to avoid pixels and specify sizes  
> in
> points or other physical units where possible.

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