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In 6.3 "Origin", in the algorithm for the ASCII serialization of an origin, step 4 says: Apply the IDNA ToASCII algorithm [to] the host part of the origin tuple, with both the AllowUnassigned and UseSTD3ASCIIRules flags set, and append the results [to] result. Insert the word "to" at both of the indicated points.
Checked in as WHATWG revision r7937. Check-in comment: Fix some typos or copypasta. http://html5.org/tools/web-apps-tracker?from=7936&to=7937