Cross Browser Fonts

Here you can find the list with the standard set of fonts common to all versions of Windows and their Mac substitutes, referred sometimes as "browser safe fonts". This is the reference I use when making web pages and I expect you will find it useful too.

Arial
Helvetica
Comic Sans MS
Courier New
Georgia
Impact
Lucida console
Lucida Sans
Palatino Linotype
book Antiqua
Tahoma
Geneva
Times New Roman
Trebuchet MS
Helvetica
Verdana
Webdings
MS Sans Serif
Ms Serif

What is the meaning of..........EM

An em is a unit of measurement in the field of typography. This unit defines the proportion of the letter width and height with respect to the point size of the current font. Originally the unit was derived from the width of the capital "M" in a particular typeface. This unit is not defined in terms of any specific typeface, and thus is the same for all fonts at a given point size.[1] So, 1 em in a 16 point typeface is 16 points.