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Both IE 11 and Chrome use iso-8859-1 as a canonical. I bet IE will not change because Shawn Steele resists any changes to legacy encodings. Opera Presto was the only browser using windows-1252 until Gecko changed the canonical name. Now Presto is dead. Gecko will turn back as soon as the spec is updated.
How is this different from bug 15340? That instead of treating them distinct we still treat them as one but change the canonical name? I thought the issue in other browsers is that they still treat them somewhat distinctly, even though encoding/decoding is identical.