Added handling for "pre" element
Added handling for "pre" element

mushroomgithub/HTMLBook,oreillymedia/HTMLBook,mushroomgithub/HTMLBook,macmillanpublishers/HTMLBook,wastemobile/HTMLBook,gitenberg-dev/HTMLBook,gitenberg-dev/HTMLBook,gitenberg-dev/HTMLBook,oreillymedia/HTMLBook,macmillanpublishers/HTMLBook,mushroomgithub/HTMLBook,oreillymedia/HTMLBook,macmillanpublishers/HTMLBook,wastemobile/HTMLBook