public int getMarkLimit() {
        return markLimit;
    }
HTML can include non-iana supported charsets that Java
recognizes, e.g. "unicode".  This can lead to incorrect detection/mojibake.
Ignore charsets in html meta-headers that are not supported by IANA.
See: TIKA-2592
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-html-module/src/main/java/org/apache/tika/parser/html/HtmlEncodingDetector.java