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The spec says "If a src attribute of a media element that is in a Document and whose networkState has the value NETWORK_EMPTY is set or changed, the user agent must invoke the media element's resource selection algorithm." Should the resource selection algorithm be run when the attribute is removed? Please state explicitly. (It makes a difference if the element has <source> children.)
Also, please be explicit about setting it to its previous value.
Clarified the removing thing. The spec already defines the meaning of "changed" regarding your second query.
Checked in as WHATWG revision r3925. Check-in comment: Clarify that removing src='' has no effect. http://html5.org/tools/web-apps-tracker?from=3924&to=3925