On Mon, 28 May 2007, Lori Lay wrote:

> I don't think you can rely on the size of elements dimensioned in ex units. 
> Eric says in his book that many user agents get their value for ex by taking 
> the value of em and dividing it in half.

Most browsers do that, and it pretty much defeats the idea of ex, but 
Firefox 2 has an adequate implementation of ex _and_ it supports 
font-size-adjust, making the unit and the property practically important 
to some extent. Using the ex unit, you naturally need to be prepared to 
having it interpreted as 0.5em.

> Also, would monitor resolutions or dot pitch have any impact on your 
> calculations?  Since you are taking a ratio, I wouldn't think so, but I 
> wonder...

They affect the estimates, but not very much when a very large font size 
is used.

-- 
Jukka "Yucca" Korpela, http://www.cs.tut.fi/~jkorpela/

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