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add a reference to http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-C74D1578 or somewhere similar?
This is already described in 1.4 where it says fragments follow WebIDL. DOMString is described there.
Fair enough, but there are 2 things. DOMString, when first used (in 2.1 Command), is rendered as "DOMString?" because it is undefined. WebIDL defines "DOMString?" to be the same as "nullable DOMString". That is misleading. If all mentions of DOMString had a definition it referenced to, it would make it discoverable, too (now section 1.4, reference to WebIDL is not very discoverable for someone who doesn't know what DOMString is and just wants to quickly understand that while reading the spec somewhere in the middle).