A way to explore the popular typefaces you have on your computer.
Click the black bar at the top of the screen and type in the name of the font you want. It will become the main font and be remembered for the future. If that doesn't work, please let me know.
We create some hidden elements and measure them before and after changing their font-family. It turns out that this isn't a new idea.
Just a couple of keyboard shortcuts: control-b = bold, control-i = italics
Firefox 2+, Safari 3+, IE7+. iOS5 Mobile Safari. OS/X a fair bit nicer than Windows.