diff --git a/planet/vendor/feedparser.py b/planet/vendor/feedparser.py
index 76167ce..b4f373d 100755
--- a/planet/vendor/feedparser.py
+++ b/planet/vendor/feedparser.py
@@ -2518,6 +2518,8 @@ def unknown_starttag(self, tag, attrs):
             elif key=='style':
                 clean_value = self.sanitize_style(value)
                 if clean_value: clean_attrs.append((key,clean_value))
+            elif key.startswith('data-'):
+                clean_attrs.append((key, value))
         _BaseHTMLProcessor.unknown_starttag(self, tag, clean_attrs)
         
     def unknown_endtag(self, tag):
diff --git a/planet/vendor/html5lib/sanitizer.py b/planet/vendor/html5lib/sanitizer.py
index 05face9..b507ea6 100644
--- a/planet/vendor/html5lib/sanitizer.py
+++ b/planet/vendor/html5lib/sanitizer.py
@@ -169,7 +169,7 @@ def sanitize_token(self, token):
                 if token.has_key("data"):
                     attrs = dict([(name,val) for name,val in
                                   token["data"][::-1] 
-                                  if name in self.allowed_attributes])
+                                  if name in self.allowed_attributes or name.startswith('data-')])
                     for attr in self.attr_val_is_uri:
                         if not attrs.has_key(attr):
                             continue