docs: def get_html_titles(index_page):
      """
      Return list of titles parsed from HTML.
  
      Args:
          index_page (str): HTML content of the page you wish to analyze.
  
      Returns:
          list: List of :class:`.SourceString` objects.
      """
      dom = dhtmlparser.parseString(index_page)
  
      title_tags = dom.find("title")
  
      return [
          SourceString(tag.getContent().strip(), "HTML")
          for tag in title_tags
          if tag.getContent().strip()
      ]