longdesc

Hi
 
Does anyone know how well the longdesc is supprted.
 
2 extracts from W3C
"For user agents that don't support "longdesc", provide a description link as well next to the graphic:"
 
and 
 
"Invisible d-links are deprecated in favor of the "longdesc" attribute."
 
I have a requirement to have a screenshot of a webpage as an image with lines pointing to different sections explaining what they are. I feel this is a case for having a text alternative in addition to the alt.
 
Thanks

		
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