Will all fonts take up the same space in the browser with the same value?
2 answers
The short answer is: No.
I'm not entirely sure of the historical reason for this, although here's one example from a fading story you're dealing with if you want to get into typography in depth.
As empirical evidence for this answer, try pasting this code into a text file and opening the file in a browser:
<div style="font-family:Arial; font-size:12px">This is 12 point type.</div><br />
<div style="font-family:Times New Roman; font-size:12px">This is 12 point type.</div><br />
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