772     @nocoverage

   772     @nocoverage

   773     def _check_html(self, output, view, template='main-template'):

   773     def _check_html(self, output, view, template='main-template'):

   774         """raises an exception if the HTML is invalid"""

   774         """raises an exception if the HTML is invalid"""

   775         output = output.strip()

   775         output = output.strip()

   776         validator = self.get_validator(view, output=output)

   776         validator = self.get_validator(view, output=output)

   777         if isinstance(validator, htmlparser.DTDValidator):

   779         if isinstance(validator, htmlparser.DTDValidator):

   778             # XXX remove <canvas> used in progress widget, unknown in html dtd

   780             # XXX remove <canvas> used in progress widget, unknown in html dtd

   779             output = re.sub('<canvas.*?></canvas>', '', output)

   781             output = re.sub('<canvas.*?></canvas>', '', output)

   780         return self.assertWellFormed(validator, output.strip(), context= view.__regid__)

   782         return self.assertWellFormed(validator, output.strip(), context= view.__regid__)

   781 

   783