seltzerlj (14) [Avatar] Offline
On page 6, "Everything between
the two tags is referred to as the contents of
the element" should end with a period.

On page 12, "HTML5 and CSS3 add standards for audio, video, interactive
graphics and custom fonts in web pages" should end with a period.

Maybe there's a pattern here, so I won't report any more missing periods for a while!