How many <head> elements can an HTML document contain?

An HTML document can contain only one <head> element.

The <head> element is crucial for defining the document's metadata, such as the title, links to stylesheets, and scripts. It must be unique within the document structure to ensure proper organization and functionality of the web page.

<html>
  <head>
    <title>Page Title</title>
  </head>
  <body>
    <p>Content here</p>
  </body>
</html>
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