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In 4.8.1 "The img element" in the algorithm for 'update the image data', step 9 says: If the list of available images, contains an entry for key, then ... Delete the comma after "images".
Checked in as WHATWG revision r7946. Check-in comment: Remove an extraneous comma. http://html5.org/tools/web-apps-tracker?from=7945&to=7946