code: def widont_html(value):
      
      def replace(matchobj):
          return force_text('%s&nbsp;%s%s' % matchobj.groups())
      return re_widont_html.sub(replace, force_text(value))
docs: Add an HTML non-breaking space between the final two words at the end of
      (and in sentences just outside of) block level tags to avoid "widowed"
      words.
  
      Examples:
  
      >>> print(widont_html('<h2>Here is a simple  example  </h2> <p>Single</p>'))
      <h2>Here is a simple&nbsp;example  </h2> <p>Single</p>
  
      >>> print(widont_html('<p>test me<br /> out</p><h2>Ok?</h2>Not in a p<p title="test me">and this</p>'))
      <p>test&nbsp;me<br /> out</p><h2>Ok?</h2>Not in a&nbsp;p<p title="test me">and&nbsp;this</p>
  
      >>> print(widont_html('leading text  <p>test me out</p>  trailing text'))
      leading&nbsp;text  <p>test me&nbsp;out</p>  trailing&nbsp;text