Re: [whatwg/encoding] Add a non-normative note about how the set of encodings was selected (#209)

@hsivonen commented on this pull request.



> @@ -612,6 +612,17 @@ prescribes, as that is necessary to be compatible with deployed content.
 <a>labels</a> are also available as non-normative
 <a href=encodings.json>encodings.json</a> resource.
 
+<p class=note>The set of supported <a for=/>encodings</a> is primarily based on the intersection
+of the sets supported by major browser engines when the development of this standard started and
+removing encodings that were rarely used legitimately but that could be used in attacks.
+The inclusion of some encodings is questionable in the light of anecdotal evidence of the level
+of use by existing Web content. That is, while they have been broadly supported by browsers,
+it is unclear if they are broadly used by Web content. However, an effort has not been made to
+eagerly remove single-byte encodings that were broadly supported by browsers or are part of the
+ISO 8859 series. In particular, the necessity of the inclusion of <a>IBM866</a>, <a>macintosh</a>,
+<a>x-mac-cyrillic</a>, <a>ISO-8859-3</a>, <a>ISO-8859-10</a>, <a>ISO-8859-14</a>,
+<a>ISO-8859-14</a>, and <a>ISO-8859-16</a> is doubtful for the purpose of supporting existing

Fixed. Thanks.

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