| <!DOCTYPE html> | |
| <script> | |
| window.x = 42; | |
| function callback2() | |
| { | |
| return this.x; | |
| } | |
| function registerCallback() | |
| { | |
| function callback1() { | |
| return callback2(); | |
| } | |
| window.parent.registerCallback(callback1); | |
| } | |
| </script> | |
| <body onload="registerCallback()"></body> |