Based on the change log for <https://trac.webkit.org/changeset/214468/webkit>, I strongly suspect that these crashes are expected behavior on iPad (the gardening in <https://bugs.webkit.org/show_bug.cgi?id=193767> reflects this suspicion). These two tests crash with an assertion that indicates the screen size is incorrect. Note that changing the 'shouldBecomeEqualToString' statements to match the iPad screen width does not prevent the crash.