they are unreliable
<rdar://problem/60244801>
Created attachment 393080 [details] Patch
Created attachment 393092 [details] Patch
Created attachment 393097 [details] Patch
Comment on attachment 393097 [details] Patch Clearing flags on attachment: 393097 Committed r258184: <https://trac.webkit.org/changeset/258184>
All reviewed patches have been landed. Closing bug.
*** Bug 208584 has been marked as a duplicate of this bug. ***
*** Bug 208678 has been marked as a duplicate of this bug. ***