HTML5 <summary> Tag
Details about the document:
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Definition and Usage
The <summary> tag contains a header for the details element, which is used to describe details about a document, or parts of a document.
Differences Between HTML 4.01 and HTML5
The <summary> tag is new in HTML5.
Tips and Notes
Tip: Use it together with the <details> tag to make your own header for the details. The header is visible, and could show the details when the user clicks on the header.
Note: The "summary" element should be the first child element of the "details" element.
The <summary> tag also supports the Standard Attributes in HTML5.
The <summary> tag also supports the Event Attributes in HTML5.