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An empty element is an element from HTML, SVG, or MathML that cannot have any child nodes (i.e., nested element or text inside an element).
The HTML, and SVG, and MathML specifications define very precisely what each element can contain. Many combinations have no semantic meaning, for example an
<audio> element nested inside an
In HTML, using a closing tag on an empty element is usually invalid. For example,
<input type="text"></input> is invalid HTML.
The empty elements in HTML: