<option> don't have a subtree... it should be invalidateStyleInternal() Though I doubt this is needed, this was added to set invalidate the `:checked` pseudo element state, which is done using other mechanisms nowadays (I think the CSSJIT stuff does this?).
<rdar://problem/84877555>
Tim, does your comment still stand? This was removed in https://github.com/WebKit/WebKit/commit/2d537f597bb34683b7d4dad754bf9e301c8e2a92#diff-ff55ba0b13c09bf56af1ab72574063b83e73df4f99d58308080cb22330e7900cL182
*** This bug has been marked as a duplicate of bug 234636 ***