HTMLImageElement: longDesc property
Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
The deprecated property longDesc
on
the HTMLImageElement
interface specifies the URL of a text or HTML file
which contains a long-form description of the image. This can be used to
provide optional added details beyond the short description provided in the
title
attribute.
Value
A string which may be either an empty string (indicating that no long description is available) or the URL of a file containing a long form description of the image's contents.
For example, if the image is a PNG of a flowchart.
The longDesc
property could be used to provide an explanation of the flow
of control represented by the chart, using only text. This can be used by readers both
as an explanation, but also as a substitute for visually-impaired users.
Usage notes
This property is deprecated and should no longer be used. Instead of
using longDesc
to provide a link to a detailed description of an image,
encapsulate the image within a link using the <a>
element.
Consider the following older HTML:
<img
src="taco-tuesday.jpg"
alt="Taco Tuesday"
longdesc="image-descriptions/taco-tuesday.html" />
Here, the longDesc
is used to indicate that the user should be able to
access a detailed description of the image taco-tuesday.jpg
in the HTML
file image-descriptions/taco-tuesday.html
.
This can be easily converted into modern HTML:
<a href="image-descriptions/taco-tuesday.html">
<img src="taco-tuesday.jpg" alt="Taco Tuesday" />
</a>
With that, the image is a link to the HTML file describing the image in more detail.
Specifications
Specification |
---|
HTML Standard # dom-img-longdesc |
Browser compatibility
BCD tables only load in the browser