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In 8.4.4 "Processing model", in the third algorithm, step 1 ends with: (e.g. before the element was disabled, or the dialog was closed, or whatever caused this algorithm to tun) Change "tun" to "run".
Checked in as WHATWG revision r8530. Check-in comment: Typo in <dialog> section http://html5.org/tools/web-apps-tracker?from=8529&to=8530