How about a hash attribute for all elements that link to external files (a, img, etc.)?It would allow you to pass an MD5, SHA-1, SHA-256, or other hash to a user-agent for automatic comparison with the linked file.I'd suggest a format where the hash algorithm is listed, followed by a forward slash and then the hash itselfExamples:hash="MD5/9e107d9d372bb6826bd81d3542a419d6"hash="SHA-1/2fd4e1c6 7a2d28fc ed849ee1 bb76e739 1b93eb12"hash="SHA-256/d7a8fbb3 07d78094 69ca9abc b0082e4f 8d5651e4 6d3cdb76 2d02d0bf 37c9e592"See my thread over at mozillaZine for more info and other ideas: http://forums.mozillazine.org/viewtopic.php?p=2234056--Wulf
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