The <article> tag specifies independent, self-contained content.
An article should make sense on its own and it should be possible to distribute it independently from the rest of the site.
Potential sources for the <article> element:
The numbers in the table specify the first browser version that fully supports the element.
The <article> tag is new in HTML5.
The <article> tag also supports the Global Attributes in HTML.
The <article> tag also supports the Event Attributes in HTML.
HTML DOM reference: Article Object
Most browsers will display the <article> element with the following default values: