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http://encoding.spec.whatwg.org/#encodings [[ Otherwise, if encoder's error handling mode is URL, emit byte 0x3F. Otherwise, emit the result of running utf-8 encode on U+0026, U+0023, followed by the shortest sequence of ASCII digits representing c in base ten, followed by U+003B. ]]
This got submitted by mistake while I was in the middle of writing bug 23927. *** This bug has been marked as a duplicate of bug 23927 ***