HTML longdesc attribute
Description
Purpose of the HTML longdesc attribute is to specify a link to a long textual description for images, iframes and frames.
When used with img element, it complements alt attribute of img. When used with iframe and frame elements, it complements title attribute.
Supported elements
HTML longdesc attribute supports img, iframe and frame elements.
Syntax
Where ElementName is any supported elements.
Type of value
URI.
Value
A URI.
Default value
There is no default value of HTML longdesc attribute.
Supported doctypes
When used with img element, HTML 4.01 strict, HTML 4.01 transitional, HTML 4.01 frameset. When used with iframe and frame elements, HTML 4.01 frameset.
Example of HTML longdesc attribute with img
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Example of HTML longdesc attribute with img </title>
</head>
<body>
<img src="../../images/w3logo5.gif" alt="The w3resource logo " longdesc="logo.txt"/>
</body>
</html>
Result
View this example in a separate browser window
Example of HTML longdesc attribute with img
Online practice editor
Example of HTML longdesc attribute with img
Note
In real world, usage of longdesc is rare with respect to img element. But writing a long description for iframe and frame is near appropriate.
Example of HTML longdesc attribute with frame
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Example of HTML longdesc attribute with frame</title>
</head>
<frameset rows="20%,*,20%" >
<frame src="header.html" frameborder="1" name="header" title="Header window"/>
<frame src="content.html" frameborder="0" name="content" title="Content window" longdesc="content-description.txt"/>
<frame src="footer.html" frameborder="0" name="footer" title="footer window" longdesc="footer-description.txt"/>
</frameset>
</body>
</html>
Result
View this example a separate browser window
Example of HTML longdesc attribute with frame
Online practice editor
Example of HTML longdesc attribute with frame
Example of HTML longdesc attribute with iframe
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Example of HTML longdesc attribute with iframe</title>
</head>
<body>
<iframe src="../../sql/customer.php" height="100%" width="540" frameborder="1" title="The customer inforamtion " longdesc="customer.txt"> </iframe>
</body>
</body>
</html>
Result
View this example in a separate browser window
Example of HTML longdesc attribute with iframe
Online practice editor
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