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In the HTML editor, when using the <meta> elements as follows: <meta charset="iso-8859-1" /> the editor generates a warning: Bad value "iso-8859-1" for attribute "charset" on element "meta": it is not the preferred encoding name. The preferred label for this encoding is "windows-1252". Of course, the preferred IANA name for the Latin-1 charset is "iso-8859-1" (See http://www.iana.org/assignments/character-sets/character-sets.xhtml), which is that described in the W3C documents.
Reproducible, the w3c validator gives me the same error (simple HTML5 file with this meta tag). If I understand [1] it is on purposed and preferred value is "name" (windows-1252 in this case) and non-preferred is label (iso-8859-1) - based on table in [2] [1] http://web.archiveorange.com/archive/v/n3B5e0evHa4ekABVsH0U#TJnyVFIvmTq4tez [2] http://encoding.spec.whatwg.org/#encodings Product Version: NetBeans IDE Dev (Build 201401240001)