| Index: client/dom/scripts/systemhtml.py | 
| diff --git a/client/dom/scripts/systemhtml.py b/client/dom/scripts/systemhtml.py | 
| index 50002e1c7dbee0c66ee5f47c13ef7850adc6f8d2..1df77152234292986eb7ca63a5ef748f4fa1e58f 100644 | 
| --- a/client/dom/scripts/systemhtml.py | 
| +++ b/client/dom/scripts/systemhtml.py | 
| @@ -196,6 +196,7 @@ _html_library_remove = set([ | 
| "Element.itemId", | 
| "Element.get:itemProp", | 
| 'Element.scrollIntoView', | 
| +    'Element.get:classList', | 
| "EmbedElement.getSVGDocument", | 
| "FormElement.get:elements", | 
| "HTMLFrameElement.*", | 
|  |