docs: def as_page(self):
          """
          Wrap this Tag as a self-contained webpage. Create a page with
          the following structure:
  
          .. code-block:: html
  
              <!DOCTYPE html>
              <html>
                <head>
                  <meta http-equiv="Content-type"
                        content="text/html"
                        charset="UTF-8" />
                  {self.resources}
                </head>
                <body>
                  {self}
                </body>
              </html>
          """
          H = HTML()
          utf8 = H.meta({'http-equiv': 'Content-type'},
                        content="text/html",
                        charset="UTF-8")
          return H.inline(H.raw('<!DOCTYPE html>'),
                          H.html(H.head(utf8, *self.resources),
                                 H.body(self)))