They don't work on mine either. Wait for HTML3 to arrive. These can be complicated and require greater explanation . The default is 3. Use sparingly and preferrably not at all.
Courier means every letter is equally spaced in relation to the letters before and after it.
Good for showing computer code or setting off other text to make it stand out like this sentence. Lawyers, writers and editors would use this. A journalist, for example, might highlight a word in this manner to indicate that it is a made up word for the given story. The size, color and font attributes work with the newer versions of Netscape and Internet Explorer. Use sparingly .