imported/w3c/web-platform-tests/css/css-images/idlharness.html Test is a flaky timeout on iOS wk2 according to history. First occurrence of a timeout is at r259566. History: https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-images%2Fidlharness.html&limit=50000&platform=ios&style=release Diff: Timeout
<rdar://problem/66867066>