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[[ However, mutation observers do fire, as required by the DOM specification. ]] http://www.w3.org/html/wg/drafts/html/master/syntax.html#creating-and-inserting-nodes It would nice to have a link to mutation observers in the DOM spec there.
HTML5.1 Bugzilla Bug Triage: Fixed the item is already linked in the specification. If this resolution is not satisfactory, please copy the relevant bug details/proposal into a new issue at the W3C HTML5 Issue tracker: https://github.com/w3c/html/issues/new where it will be re-triaged. Thanks!