@Override
    public boolean contains(Charset cs) {
        return cs.equals(this);
    }
An implementation of the standard "replacement" charset defined by the W3C.
See: https://encoding.spec.whatwg.org/#replacement
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-html-module/src/main/java/org/apache/tika/parser/html/charsetdetector/charsets/ReplacementCharset.java