It's possible to view the markup used to create any question or answer. (This may be useful if you wish to combine answers or quote part of the question with formatting.)
If the question or answer has been edited so that it has an edited X timeunits ago link, you can click onuse that link to view the revision history and, then clickuse the view source link to open a new tab/window with it in.
If it hasn't been edited then you can still view the revision history, but you'll have to manually enter the url in your browser's address bar. For questions, take the number in the middle of the page's url; for answers click onuse the linklink link for the answer to get it's unique number in the anchor of the url (after the # character) and then go to the url:
http://stackoverflow.com/revisionsposts/number/listrevisions