Reminder:
In Internet Explorer the font depends on the character set of the page. For iso-8859-1, MS Shell Dlg is used. For utf-8, "Arial" is used.
Firefox/Mozilla uses MS Shell Dlg for either character set. If the required glyph does not exist in this font, it uses "Arial Unicode MS".
For example, these buttons have the same values as the text above them:
G a g ⌆
Compare these buttons where the font is specified:
Microsoft Sans Serif:
Times New Roman:
Arial:
Tahoma:
Arial Unicode MS:
Lucida Sans Unicode: