Support character references for &, <, >, ' and "#5
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Polyglot HTML 5 markup (i. e. HTML 5 written in a way to be valid XML) only uses very few named entity references:
https://www.w3.org/TR/html-polyglot/#named-entity-references
To support working with content that has been created before HTML5 – that is, XHTML1 – we substitute all named and character references with their plain values, which should not pose a problem in UTF-8 content. Only
&,<,>,"and'shall be kept.We missed, however, that e. g.
&can also be written as&; similar for the other characters. This PR adds support for these cases as well.