value of attribute "checked" cannot be "1"; must be one of "checked".

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39825 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/Formulator/Widget.py

@@ -424,7 +424,7 @@ class CheckBoxWidget(Widget):
       return render_element("input",
                             type="checkbox",
                             css_class=field.get_value('css_class'),
-                            checked=1,
+                            checked='checked',
                             extra=field.get_value('extra'),
                             disabled='disabled')
     else: