| PASS idl_test setup | |
| PASS idl_test validation | |
| PASS Partial namespace CSS: original namespace defined | |
| PASS Partial namespace CSS: member names are unique | |
| PASS CSS namespace: operation escape(CSSOMString) | |
| FAIL CSS namespace: attribute elementSources assert_own_property: CSS does not have property "elementSources" expected property "elementSources" missing | |