Span and Div
Text: Abbreviations, Quotations, and Code
Meta Tags
Tables: rowspan and colspan
Description Lists
Text: Addresses, Definitions, Bi-directional, and Editorial
Sectioning

Text: Time, Mark and Presentational
Conditional Comments
Tables: Columns, Headers, and Footers
Accessible Links
Accessible Forms
HTML5 Forms Pt. 1: Input Types
HTML5 Forms Pt. 2: Attributes and Data Lists
Embedded Content: Video, Audio, and Canvas