code: def get_head_form_html(req: "Request", forms: List[Form]) -> str:
      
      # https://docs.pylonsproject.org/projects/deform/en/latest/widget.html#widget-requirements
      js_resources = []  # type: List[str]
      css_resources = []  # type: List[str]
      for form in forms:
          resources = form.get_widget_resources()  # type: Dict[str, List[str]]
          # Add, ignoring duplicates:
          js_resources.extend(x for x in resources['js']
                              if x not in js_resources)
          css_resources.extend(x for x in resources['css']
                               if x not in css_resources)
      js_links = [req.static_url(r) for r in js_resources]
      css_links = [req.static_url(r) for r in css_resources]
      js_tags = ['<script type="text/javascript" src="%s"></script>' % link
                 for link in js_links]
      css_tags = ['<link rel="stylesheet" href="%s"/>' % link
                  for link in css_links]
      tags = js_tags + css_tags
      head_html = "\n".join(tags)
      return head_html
docs: Returns the extra HTML that needs to be injected into the ``<head>``
      section for a Deform form to work properly.