@Field
    public void setMarkLimit(int markLimit) {
        this.markLimit = markLimit;
    }
How far into the stream to read for charset detection.
Default is 8192.
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-html-module/src/main/java/org/apache/tika/parser/html/charsetdetector/StandardHtmlEncodingDetector.java