--- a/devtools/testlib.py	Mon Jan 25 19:48:19 2010 +0100
+++ b/devtools/testlib.py	Mon Jan 25 21:16:42 2010 +0100
@@ -657,6 +657,9 @@
         if validatorclass is None:
             return None
         validator = validatorclass()
+        if isinstance(validator, htmlparser.DTDValidator):
+            # XXX remove <canvas> used in progress widget, unknown in html dtd
+            output = re.sub('<canvas.*?></canvas>', '', output)
         return validator.parse_string(output.strip())
 
     # deprecated ###############################################################