longdesc attribute
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In HTML, longdesc is an attribute used within the image element, frame element, or iframe element. It is used to reference a long description website of the image, frame, or iframe in question.[1]
While longdesc was designed to be used by screen readers to display image information for computer users with accessibility issues, such as the blind or visually impaired,[2] it is actually seldom used for this purpose, because there are relatively few authors who use the attribute, and most of those authors use it incorrectly.[3]
Example
<img src="Hello.jpg" longdesc="description.html">Content of description.html:
...
<p>This is an image of a two-layered birthday cake.</p>
...Linking to the long description in the text
Since very few browsers and screen readers do make the link available at all, it is advisable to include a link to the description page near the img element.
Example
<img src="Hello.jpg" longdesc="description.html"> [<a href=
"description.html" title="long description of the image">D</a>]Obsoleting longdesc
HTML5 forbids the usage of the longdesc attribute by authors, due to it limited use.[4]
See also
References
- ↑ "Objects, Images, and Applets". W3C. http://www.w3.org/TR/REC-html40/struct/objects.html. Retrieved 2008-12-20.
- ↑ "Creating Accessible Images". WebAim. http://www.webaim.org/techniques/images/longdesc.php#longdesc. Retrieved 2008-12-20.
- ↑ http://wiki.whatwg.org/wiki/Longdesc_usage
- ↑ http://www.whatwg.org/html5/#attr-img-longdesc
External links
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