input element supports: datetime|datetime-local|date|month|week|time|number|range|email|url - perfect for validation.
manifest attribute, lending more support to offline (web) apps.
The strike tag is being binned. The funny thing being all the blogs that use the tag to indicate a correction will, without an update (and if they're in standards mode), have the mistake plugged back in. Then again, the browsers will probably keep the tag.