Proper Tags for Displaying Content Edits
The proper way to mark up changes to an HTML document, when you wish to retain the old content while displaying the new.
I <del>hate</del> <ins>LOVE</ins> my new iPod nano.
The browser defaults are usually a strikeout/cross-through of del, and an underline for ins.
*May or may not contain any actual "CSS" or "Tricks".