HTML5 <aside> Tag
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Definition and Usage
The <aside> tag defines some content aside from the content it is placed in.
The aside content should be related to the surrounding content.
Differences Between HTML 4.01 and HTML5
The <aside> tag is new in HTML5.
Tips and Notes
Tip: The <aside> content could be placed as a sidebar in an article.
The <aside> tag also supports the Standard Attributes in HTML5.
The <aside> tag also supports the Event Attributes in HTML5.