TODO - Check how we compare to the HTML5 parsing rules - limit the length of markup elements that never end. Perhaps by configurable limits on the length that markup can have and still be recognized. Report stuff as 'text' when this happens? - remove 255 char limit on literal argspec strings - implement backslash escapes in literal argspec string - (parameter entities) - make literal tags configurable. The current list is hardcoded to be "script", "style", "title", "iframe", "textarea", "xmp", and "plaintext". SGML FEATURES WE WILL PROBABLY IGNORE FOREVER - Empty tags: <> (repeat previous start tag) - (same as ) - NET tags and