On Jan 28, 2011, at 3:33 AM, Goldsmith, Marissa wrote:

> The gist
> of my question is, has anyone ever noticed CSS rendering differences
> (especially regarding margins) between the various Mac OS10 versions?
> 
> 
>  (which had
> SF 4,5 and Firefox 3) looked fine.

(aside - that would probably Safari 4.1 and /or Safari 5)

> While investigating deeper, what we
> discovered was that I was looking at OS10.4 and 10.5, while the other
> end-user had OS10.6.

10.6 is a possible clue…
Absent a URL, I can only venture a guess.
Was/is the site using 'Helvetica Neue' as a font ? 10.6 ships with and extra 
face for Helvetica Neue: Helvetica Neue Medium which is slightly heavier than 
the normal face as its name implies. Now here is the catch: the browser default 
for 'strong' and 'b' is 'font-weight: bolder', and if Helvetica Neue is 
specified, the browser will use that Helvetica Neue Medium.
<http://emps.l-c-n.com/notebook/HelveticaNeue-font-weight>

If you have a largish block of bolded text, this may affect how many words fit 
on one line. Note also, in this context, that the medium face has a slightly 
different intrinsic line-height. hat may affect how much white space is 
perceived above/below a block.

Other guesses have already been mentioned, namely that the affected visitor has 
a different font-size set, or a minimum font-size set. A third possibility is 
that the affected user doesn't have your preferred font installed or activated.

Otherwise, everything being equal, no, I've never noticed any difference 
between the various versions of OS X, nor shouldn't there be. 


Philippe
---
Philippe Wittenbergh
http://l-c-n.com/





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