public int getMarkLimit() {
        return markLimit;
    }
Extracts a charset from a Content-Type HTTP header.

@param metadata parser metadata
@return a charset if there is one specified, or null
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-html-module/src/main/java/org/apache/tika/parser/html/charsetdetector/StandardHtmlEncodingDetector.java