code: def quote_html(content):
      
      new_content = ''
      for symbol in content:
          new_content += HTML_QUOTES_MAP[symbol] if symbol in _HQS else symbol
      return new_content
docs: Quote HTML symbols
  
      All <, >, & and " symbols that are not a part of a tag or
      an HTML entity must be replaced with the corresponding HTML entities
      (< with &lt; > with &gt; & with &amp and " with &quot).
  
      :param content: str
      :return: str