The following test started failing since r237931-237935:
@@ -1,11 +1,11 @@
+CONSOLE MESSAGE: line 15: ReferenceError: Can't find variable: HTMLAttachmentElement
This tests the :has-attachment pseudoclass.
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS getComputedStyle(target).clear is "both"
-PASS getComputedStyle(target).clear is "none"
-PASS successfullyParsed is true
+FAIL successfullyParsed should be true (of type boolean). Was undefined (of type undefined).
The root cause of this is the same as bug 141699: that the attachment element is not enabled on GLIB.
*** This bug has been marked as a duplicate of bug 141699 ***