Handling for "mark" element.
Handling for "mark" element.

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