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em, eh?

Sent by tedd on 31 January 2004 22:10


>tedd wrote:
>
>>In fact, I've even found that em's are given different values 
>>within the same browser at different zoom levels.  For example, if 
>>x em is given a space of y pixels at 100 percent zoom, then a 200% 
>>zoom does not necessarily translate to twice the size in pixels 
>>even within the same browser.

Sebastian Redl answered:

>That's because em is dependent on the text size.

And, Felix Miata added:

>Before considering zoom at all, it might be wise to consider that 100%
>has different meanings. An unzoomed browser using a 13px default at
>800x600 is 100%, just as an unzoomed browser using a 26px default at
>1600x1200 is 100%. On any given display size, both produce the same
>physical text sizes.

Okay, let me say it a different way.

Given the same machine and browser using the same font and the 
identical same character, let's say arial "X" for example -- 
shouldn't a zoom level of 200% show "X" twice as large as 100%? 
Likewise, shouldn't 300% show the character three times as large?

And, if this is not true, then shouldn't the ratio between the 
character shown at 100%, 200%, and 300% be the same? In other words, 
shouldn't it be linear?

I realize there are differences between how fonts are displayed and 
differences between screen resolutions on different platforms, but 
the basic units of measurement should be consistent throughout -- 
shouldn't they?

For example, I may speak in Dollars, and others speak in Eurodollars, 
while still others speak in Pounds, but we all agree that twice any 
amount is still 200% of the original amount, correct?

 From my perspective, if we are to use em's for positioning (or 
anything for that matter) in css, then shouldn't there be some 
expectation of continuity in those basic measurements between 
platforms and browsers -- or is this just something that's not 
predicable and browser designers just make up those measurements as 
they go?

Or, do you know?

tedd
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