FWIW, if you fireup firefox web console with ctrl+shift+k and execute document.evaluate( 'substring(//title,1,9)', document , null , XPathRe
+sult.ANY_TYPE , null )
you will get a [object XPathResult], and if you click on it, there will be a stringValue: "Comment o"
So you need Dump-er earlier and pick the right key/attribute
Found by grep for xpath in mechanize-firefox/mozrepl, lookup https://developer.mozilla.org/en-US/docs/DOM/document.evaluate and https://developer.mozilla.org/en-US/docs/Introduction_to_using_XPath_in_JavaScript
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