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In the v1 document, in 4.8. "User objects implementing callback interfaces", in the first algorithm, step 3 says: Let X be the implementation of the operation. If the interface is a single operation callback interface and ... where "single operation callback interface" is a link whose start tag is <a class="dfnref" href="#dfn-single-operation-callack-interface"> Change "callack" to "callback".
http://dev.w3.org/cvsweb/2006/webapi/WebIDL/v1.xml.diff?r1=1.112;r2=1.113;f=h