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http://encoding.spec.whatwg.org/#encodings [[ To get an encoding from a string label, run these steps: ]] The string "latin-1" should be added as an alias for "windows-1252". I see it used as an example in the document PEP 0263 <http://www.python.org/dev/peps/pep-0263/>, and it may also appear elsewhere.
As far as I know there is no browser support for that label. Adding support for it may actually break pages in unexpected ways.
Now I understand: the list shows labels supported by browsers, not necessarily elsewhere.
Right, the assumption is also that if we add or remove from the last we may break the web in the process so we have to be somewhat conservative about it. Or at least only do it as much as implementations are willing.