use storage event in iframe

createStorageMessageFrame.js

function createStorageMessageFrame(){
  const listener ='function(e){window.top.postMessage({key: e.key, oldValue: e.oldValue,newValue: e.newValue}, \''+ window.location.origin +'\')}'
  const frame = document.createElement('iframe')
  frame.style.width = 0
  frame.style.height = 0
  frame.style.border = 'none'
  frame.style.overflow = 'hidden'
  frame.style.visibility = 'hidden'
  document.body.appendChild(frame)
  
  frame.contentWindow.document.open()
  frame.contentWindow.document.write("<script>window.addEventListener('storage', "+ listener +")<\/script>")
  frame.contentWindow.document.close()
}