| <!DOCTYPE html> | |
| <!-- | |
| There's two URL parameters supported here: | |
| window: The property name of a getter on the global object that returns the relevant WindowProxy | |
| object to message. | |
| ident: A reasonably unique identifier that will be echoed as the message. | |
| --> | |
| <script> | |
| const params = new URLSearchParams(location.search); | |
| self[params.get("window")].postMessage(params.get("ident"), "*"); | |
| </script> |