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In 3.2.2, "readonly attribute HTMLPropertiesCollection properties;", there is no definition for HTMLPropertiesCollection in the specification.
HTML5.1 Bugzilla Bug Triage: This attribute does not exist in the current draft. 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!