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http://dev.w3.org/csswg/cssom/#the-medialist-interface [[ [ArrayClass]interface MediaList { ]] should be NoInterfaceObject for same reason as DOMRectList. Also StyleSheetList. See https://www.w3.org/Bugs/Public/show_bug.cgi?id=26200
https://github.com/w3c/csswg-drafts/commit/33aba3a0da47571a3ec4a64df439d5bd71ec244d
The change was bogus for MediaList since it has appendMedium/deleteMedium. Also missed CSSRuleList. But the rationale for [NoInterfaceObject] for DOMRectList is not clear to me, so revert this for now. https://github.com/w3c/csswg-drafts/commit/e8258f81409134954310b032b566889492475a0a