| <!DOCTYPE html> | |
| <div>This frame should not be focused!</div> | |
| <script> | |
| let got_focus = false; | |
| window.addEventListener("focus", () => { | |
| got_focus = true; | |
| }); | |
| window.addEventListener("load", () => { | |
| parent.postMessage("child_loaded", "*"); | |
| }); | |
| window.addEventListener("message", event => { | |
| if (event.data == "attempt_to_focus") { | |
| window.focus(); | |
| let msg = got_focus ? "child_is_focused" : "child_is_not_focused"; | |
| parent.postMessage(msg, "*"); | |
| } | |
| }); | |
| </script> |