}

    /**
     * Sets whether to process Google on/off comment directives.
     *
     * @param useGoogleOffOn true to enable Google on/off processing, false to disable
     */
    public void setUseGoogleOffOn(final boolean useGoogleOffOn) {
        this.useGoogleOffOn = useGoogleOffOn;
    }

    /**
     * Extracts thumbnail URL from the HTML document.