4 Element Styles
Some spans:
- “stt” 
- “sroman” 
- “slant” 
- “ssanserif” 
- “Smaller” 
- “Larger” 
- “hspace” is used for forced space 
- “url” is used for URLs: http://racket-lang.org 
- “nobreak”, which is used to prevent line breaks anywhere in the element so that the element may run too far right 
- italic directly sets font-style to italic 
- bold directly sets font-weight to bold 
- superscript directly sets vertical-align to super and font-size to 80%. 
- subscript directly sets vertical-align to sub and font-size to 80%. 
Link spans:
- “plainlink” hyperlink to here 
- technical term references are in “techoutside”, then “techinside”