I raised a specification issue  about descendants of <optgroup disabled> being clickable in Marionette, even after  lands. For Marionette, fixing this bug depends on some work from  because it contains some nice new primitives for finding the closest ancestors and for determining the disabledness state of elements.  https://github.com/w3c/webdriver/issues/1190  https://bugzil.la/1429384  https://bugzil.la/1354211
[Mass update] Setting P1 as currently being worked on.
Priority: -- → P1
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