Although I've been using EM's in CSS and HTML to define font sizes for years I've only just discovered the definition of an EM. It's the with of a capital M in a particular font.
An EM-Dash is a dash that is the width (length) of an EM, which is usually longer than a standard dash.
I'm not a huge fan of the EM actually. Nor do I like it when people use px for fonts.
ReplyDeleteI guess if I had to choose one standard for everything, it would be pixels...but fonts have always been measured in points (pt) for me :P