https://jsoup.org/: jsoup is a Java library for working with real-world HTML. It provides a very convenient API for extracting and manipulating data, using the best of DOM, CSS, and jquery-like methods. jsoup implements the WHATWG HTML5 specification, and parses HTML to the same DOM as modern browsers do. (Jonathan Hedley)
  • Jonathan Hedley 
package org.jsoup.nodes;

import org.jsoup.parser.HtmlTreeBuilder;
import org.jsoup.parser.Parser;


Internal helpers for Nodes, to keep the actual node APIs relatively clean. A jsoup internal class, so don't use it as
there is no contract API).

/**
 * Internal helpers for Nodes, to keep the actual node APIs relatively clean. A jsoup internal class, so don't use it as
 * there is no contract API).
 */
final class NodeUtils {
    
Get the output setting for this node,  or if this node has no document (or parent), retrieve the default output
settings

/**
     * Get the output setting for this node,  or if this node has no document (or parent), retrieve the default output
     * settings
     */
    static Document.OutputSettings outputSettings(Node node) {
        Document owner = node.ownerDocument();
        return owner != null ? owner.outputSettings() : (new Document("")).outputSettings();
    }

    
Get the parser that was used to make this node, or the default HTML parser if it has no parent.

/**
     * Get the parser that was used to make this node, or the default HTML parser if it has no parent.
     */
    static Parser parser(Node node) {
        Document doc = node.ownerDocument();
        return doc != null && doc.parser() != null ? doc.parser() : new Parser(new HtmlTreeBuilder());
    }
}