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Specification: http://www.whatwg.org/specs/web-apps/current-work/multipage/ Multipage: http://www.whatwg.org/C#contents Complete: http://www.whatwg.org/c#contents Referrer: http://stackoverflow.com/questions/11314668/what-elements-can-a-span-tag-contain-in-html5 Comment: Element h4 not allowed as child of element ul in this context. Posted from: 117.195.104.104 User agent: Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Firefox/31.0
Are you expecting <ul><h4> to be allowed?