The HTML <iframe> longdesc Attribute is used to specify a page that contains the long description of the content of the iframe element.

Syntax:

<Iframe longdesc="URL"> 

Attribute Values:

• URL: It contains single value i.e URL which specify the page which contains the long description of the content of the frame.
  1. An absolute URL: It points to another website.
  2. A relative URL: It points to a file within a website.

Example:

Output:

Supported Browsers: The major browsers are not supported by HTML <iframe> longdesc Attribute.