How to add HTML <img> longdesc Attribute

The longdesc attribute specifies a hyperlink to a detailed description of an image.

Several examples of how to use the longdesc attribute.

Browser Support

Syntax

Attribute Values

Value	Description
string	A hyperlink to a detailed description of an image. Possible values: An id to another element An absolute URL - points to another web site (like longdesc="http://www.example.com/description.txt") A relative URL - points to a file within a web site (like longdesc="description.txt")

Value

Description

string

A hyperlink to a detailed description of an image.

Possible values:

An id to another element
An absolute URL - points to another web site (like longdesc="http://www.example.com/description.txt")
A relative URL - points to a file within a web site (like longdesc="description.txt")

index.html

Example: HTML

<!DOCTYPE html>
<html>
<body>

<h1>The img longdesc attribute</h1>

<!-- The description is on the same page as the image -->
<img src="https://horje.com/avatar.png" alt="Horje.com" width="100" height="132" longdesc="#w3htmlExplained">

<!-- The description is in an external page -->
<img src="https://horje.com/avatar.png" alt="Horje.com" width="100" height="132" longdesc="w3html.txt">

<!-- The description is one of several within an external page -->
<img src="https://horje.com/avatar.png" alt="Horje.com" width="100" height="132" longdesc="http://example.com/desc#item3">

<!-- The description is included in a data:URI -->
<img src="https://horje.com/avatar.png" alt="Horje.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 https://horje.com/avatar.png</h2>
  <p>Description of the image...</p>
</div>

</body>
</html>

Output should be:

Type:	html
Category:	Web Tutorial
Sub Category:	HTML Tag
Uploaded by:	Admin