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The specification states: [Definition: The void elements of HTML5 are area, base, br, col, command, embed, hr, img, input, keygen, link, meta, param, source, track and wbr.] however, "command" appears not to be listed in http://www.w3.org/TR/html5/index.html#elements-1
Looks like it was removed during CR period. It last appeared here... http://www.w3.org/TR/2012/CR-html5-20121217/index.html#elements-1
At the telecon on 2015-05-19, the WG agreed to resolve this by removing 'command' from the list