HTML Summary Tag
The HTML summary tag is always used with details tag. The summary element must be the first child of a tag. It is used within the tag.
The summary element is used as a summary, caption, heading or legend for the content of a details element.
The <summary></summary> tag is new in HTML5.
The <summary> tag is written as <summary></summary> with the summary/legend inserted between the start and end tags.
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