• Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

Chapter 9. Equivalent Alternatives > When ALT Text Isn’t Enough: Extended Descr...

When ALT Text Isn’t Enough: Extended Descriptions

ALT text works well for simple images, graphical links, and image maps. But there are times when developers must use rich, complex images to convey rich, complex ideas and information. In these cases, ALT text by itself is too short to accomplish this important task. For example, if the page includes a graph or chart representing complex logical or mathematical relationships, or a photograph of a historic event, an extended description should supplement the ALT text.

You may include the extended description in the content of the page itself or on a separate page linked to the page that displays the image. (Which of these is the right solution in a given instance depends on the context and on what will best help your audience understand what you want them to understand.) HTML 4.0 includes a longdesc attribute designed for this purpose, but this technique has not been well supported until quite recently. As of March 2002, however, both IBM’s Home Page Reader, versions 3.0 and higher, and JAWS 4.01 support the longdesc attribute. The <img> element may include both alt and longdesc attributes, as in the following example.


PREVIEW

                                                                          

Not a subscriber?

Start A Free Trial


  
  • Creative Edge
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint