Patch forthcoming.
Created attachment 323861 [details] the patch
<rdar://problem/35000510>
Landed in http://trac.webkit.org/changeset/223415/webkit
Comment on attachment 323861 [details] the patch View in context: https://bugs.webkit.org/attachment.cgi?id=323861&action=review > Source/WebCore/dom/ContainerNodeAlgorithms.cpp:88 > - ASSERT_WITH_SECURITY_IMPLICATION(NoEventDispatchAssertion::isEventDispatchAllowedInSubtree(insertionPoint)); > + RELEASE_ASSERT(NoEventDispatchAssertion::isEventDispatchAllowedInSubtree(insertionPoint)); This is useless because NoEventDispatchAssertion is not enabled in release builds.