The longDesc property specifies a url for a longer description of the contents of the current frame.
Syntax
url = frameElement.longDesc
frameElement.longDesc = url
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Parameters
The url string provides a url where a longer description of the current frame can be found.
Example
f = document.getElementById("main-frame");
f.longDesc = "http://www.netcape.com/supplements/more.html";
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Notes
In the case of FRAME elements, the longDesc property is a way to point to a longer description than the title of the FRAME provides
Specification
DOM Level 2 -- HTMLFrameElement