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Re: font sizes in ems

From: Gayle Kidder <reddik@sandiego.com>
Date: Thu, 17 Jul 1997 16:25:28 -0700
Message-ID: <33CEA9E8.855084D0@thegroup.net>
To: www-style@w3.org
David Perrell wrote:
 
> Your test page is meaningless. You are comparing a reader-font-relative
> size of 1em to an absolute size of 10pt. To make your test valid, add
> this to the declaration:
> 
>           BODY { font-size: 10pt }
> 
> Now, all of your em measurements should refer to the 10pt BODY (the
> parent of P), and so 1em should equal 10pt for each of the fonts.

I tried this and it doesn't matter a whit what I put in as BODY
font-size. It all comes out the same. Which means it's ignoring the BODY
setting, apparently.

See a second demo at:
http://www.beachmedia.com/www/emdemo2.html
I've set the BODY font-size to a ridiculous 16 pts, but it doesn't
affect the display at all in either browser, only the last para.
 
> As to why you're getting a different relationship in MSIE and NSN -- is
> the default font size exactly the same in both browsers? Remember,
> since you did not explicitly set a size on BODY, your em measurements
> are relative to the _default_ font size of the browser. That's the
> whole point!

The browsers were set to the same size, as far as one can guess (MSIE
forgoes point size designations for smallest, small, medium, large,
largest). I tried changing the default font and font size in both
browsers. This only seemed to have an effect in Netscape, and only with
a few odd font choices.
 
> All you need to remember is that
> 
> (1) 1em = 100% of the font size.
> 
> (2) you have no way of knowing the point or pixel size of a client's
> default font, therefore em or percent are the best way to give a reader
> a font size relative to what she/he is accustomed to reading.

But only with a proper conversion value.... which is my point (or
pixel).

Gayle Kidder
Received on Thursday, 17 July 1997 19:28:31 GMT

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