On Wed, 10 Dec 2008 16:38:16 -0500, Felix Miata wrote:
> On 2008/12/10 23:15 (GMT+0200) Jukka K. Korpela composed:
>
>> There is indeed a lot of variation...
>>
> That they do: http://fm.no-ip.com/auth/Font/font-rounding.html
>
>> What's puzzling is that IE seems to _truncate_ e.g. 11.9px to 11px instead of
>> rounding it to 12px.
>>
>
> More than just seems to, and it doesn't really puzzle me. AFAIK, truncation 
> of px font
> size decimals is fallout from a M$ design decision made, probably for <font 
> size=X>
> and/or <big>/<small> handling, long before the existence of CSS. What was the 
> first IE
> made from, Mosaic? It wouldn't surprise me if that held its inception.

Thanks to Felix for the font-size samples. It's instructive to look
at them in as many browsers as possible.

After a lot of experimentation, I concluded the following percentages
work reasonably well, with nominal points and pixels listed for 96 DPI
resolution. As others rightly caution, expect a pixel difference here
and there.

Points vs. Pixels and Percents
Nominal Points Size             Pixels/Percent
6pt nonpareil                           8px     50%
7pt minion                                      9px     56.5%
8pt brevier                                     11px    69%
9pt bourgeois                           12px    75%
10pt long primer                        13px    82%
11pt small pica                         15px    94%
12pt pica                                       16px    100%
14pt english                                    19px    119%
16pt columbian                          21px    132%
18pt great primer                       24px    150%
21pt double small pica  28px    175%
24pt double pica        32px    200%
36pt double great primer        48px    300%

All results at 96 DPI. I still have to test at 120 DPI.

I hope this is helpful.

Cordially,
David
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