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If you have an online whitelist section as follows /a /ab /abc then the last two entries are not needed at all. It would probably be good for conformance checkers to point out this redundancy.
Checked in as WHATWG revision r4171. Check-in comment: cache manifests should not have overlapping online whitelist namespaces http://html5.org/tools/web-apps-tracker?from=4170&to=4171