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 
Util methods used by Jsoup. Please don't depend on the APIs implemented here as the contents may change without
notice.

/**
 * Util methods used by Jsoup. Please don't depend on the APIs implemented here as the contents may change without
 * notice.
 */
package org.jsoup.internal;