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<!DOCTYPE html>
<html>
<body>
<h1>The img longdesc attribute</h1>
<!-- The description is on the same page as the image -->
<img src="w3html.gif" alt="W3Schools.com" width="100" height="132" longdesc="#w3htmlExplained">
<!-- The description is in an external page -->
<img src="w3html.gif" alt="W3Schools.com" width="100" height="132" longdesc="w3html.txt">
<!-- The description is one of several within an external page -->
<img src="w3html.gif" alt="W3Schools.com" width="100" height="132" longdesc="http://example.com/desc#item3">
<!-- The description is included in a data:URI -->
<img src="w3html.gif" alt="W3Schools.com" width="100" height="132" longdesc="data:text/html;charset=utf-8;,%3C!DOCTYPE%20html%3E%3Chtml%3E%3Chead%3E%3Ctitle%3EDescription%20of%20the%20Logo%3C/title%3E%3C/head%3E%3Cbody%3E%3Cp%3ESome%20description%20goes%20here%3C/body%3E%3C/html%3E">
<div id="w3htmlExplained">
  <h2>Image w3html.gif</h2>
  <p>Description of the image...</p>
</div>
</body>
</html>