HTML: Id Attribute

The id attribute specifies a unique id for an HTML element. The value must be unique within the HTML document.

The id attribute is mostly used to point to a style in a style sheet, and by JavaScript (via the HTML DOM) to manipulate the element with the specific id. The id attribute can be used on any HTML element.


  • Must begin with a letter A-Z or a-z.
  • A class name cannot start with a number.
  • Must not contain any space characters.
  • Can be followed by: letters (A-Za-z), digits (0-9), hyphens (“-“), and underscores (“_”).
  • In HTML, all values are case-insensitive.
		<title> id attribute</title>
				color: blue;
				color: brown;
		<a href="#imp">Important</a>
		<p id="top">
			Once upon a time, all the birds - the swans, cranes, </p>
		<h3 id="imp">
			Goodwill is that unseen force which is </h3>
		<p>He has neither the time, nor the interest to bother </p>
		<a href="#top">Go to Top</a>
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