Accept commas in unquoted attribute values.
This closes SF patch #669683.
diff --git a/Lib/sgmllib.py b/Lib/sgmllib.py
index 021c8b5..a4f0a8b 100644
--- a/Lib/sgmllib.py
+++ b/Lib/sgmllib.py
@@ -34,7 +34,7 @@
 tagfind = re.compile('[a-zA-Z][-_.a-zA-Z0-9]*')
 attrfind = re.compile(
     r'\s*([a-zA-Z_][-:.a-zA-Z_0-9]*)(\s*=\s*'
-    r'(\'[^\']*\'|"[^"]*"|[-a-zA-Z0-9./:;+*%?!&$\(\)_#=~\'"]*))?')
+    r'(\'[^\']*\'|"[^"]*"|[-a-zA-Z0-9./,:;+*%?!&$\(\)_#=~\'"]*))?')
 
 
 class SGMLParseError(RuntimeError):