class_docstr: Lexer for UL4 embedded in HTML.
code: def __init__(self, **options):
      super().__init__(HtmlLexer, UL4Lexer, **options)
  
imports: import re
  from pygments.lexer import RegexLexer, DelegatingLexer, bygroups, words, include
  from pygments.token import Comment, Text, Keyword, String, Number, Literal, Name, Other, Operator
  from pygments.lexers.web import HtmlLexer, XmlLexer, CssLexer, JavascriptLexer
  from pygments.lexers.python import PythonLexer
label_desc: Use image node_id 1 to create a new HTMLUL4Lexer object from inherited base classes: DelegatingLexer with example: obj = HTMLUL4Lexer()