javascript:(function(){document.designMode = document.designMode === "on"? "off":"on"})();Toggles between edit/non-edit mode.
This is good for quick iterating on wording while developing or responding to feedback. Also good for tripping people out with news headlines that have their name inserted into them.
Really, what I wanted to mention is that this is a super-quick way to do a simple spell check against a live page. Flip on edit mode, and look for the squiggly underlines.