What happens if the <doctype html> is missing in an HTML document?

If the <doctype html> is missing, the browser may enter quirks mode.

Quirks mode can lead to inconsistent rendering across different browsers, as it does not strictly follow the HTML specifications. This can result in unexpected layout and styling issues.

<html>
  <head>
    <title>Sample Page</title>
  </head>
  <body>
    <p>Hello, world!</p>
  </body>
</html>
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