window.location.href = http://127.0.0.1:8000/security/postMessage/data-url-sends-null-origin.html
Received message: data="Hello from child" origin="null"
window.location.href = http://127.0.0.1:8000/security/postMessage/data-url-sends-null-origin.html
Received message: data="Hello from child" origin="null"