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In 4.2.24.2 "Platform array object [[DefineOwnProperty]] method", step 2.5 says: If newLen > oldLen: Insert ", then" before the colon? (It's understandable as is, this is just for consistency.)
http://dev.w3.org/cvsweb/2006/webapi/WebIDL/Overview.xml.diff?r1=1.664;r2=1.665;f=h http://dev.w3.org/cvsweb/2006/webapi/WebIDL/v1.xml.diff?r1=1.105;r2=1.106;f=h