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Web Accessibility - Priority 1

Web Accessibility: Priority 1

Web Accessibility: Dynamic Content

Update Equivalents for Dynamic Content

Dynamic content is content that changes over time or in response to user actions. When dynamic content changes, equivalent information must also be updated. For example, with a timed series of images depicting various careers, text descriptions must change with the images.

Frame sources should be HTML files (not images) so text alternatives change correctly. The following inaccessible example illustrates why frame sources cannot be images:


            
            
               <HTML> 

               <HEAD>
            
            

            
            <TITLE>A bad frameset document</TITLE>
            
            

                        
            </HEAD>
            
            

            
            <FRAMESET cols="100%" title="Static frameset">
            
            

            
            
               <FRAME name="badframe" src="bcmap.gif" title="Map of 
               British Columbia">


            
            </FRAMESET>
            
            

            
            </HTML>

If a link causes a new image to be inserted into the frame:


               Visit the British Columbia’s Interior <a 
               target="badframe" href="interior.gif" title="Interior 
               Region"> for unique employment opportunities</a>.

the initial title of the frame ("Map of British Columbia") will no longer match the current content of the frame ("Interior Region").

Correct coding looks like this:


            
               <FRAME name="goodframe" src="map.html" title="Map of 
               British Columbia">
            

            
            </FRAMESET>

And the code in map.html should look like this:

<IMG src="bcmap.gif" alt="Map of British Columbia.">