Each of those words has a CSS class called 'goog-spellcheck-word'. It appears that the content from this article was copied out of a WYSYWIG editor, and those CSS tags were copied as well.

He's letting us read what his spellchecker thinks about his article.

  <span class="goog-spellcheck-word" style="background: none repeat scroll 0% 0% yellow;">McNealy</span>