| <!DOCTYPE html> | |
| <input id="target" value="This should be focused!" autofocus></input> | |
| <script> | |
| let got_focus = false; | |
| target.addEventListener("focus", () => got_focus = true); | |
| window.addEventListener("load", () => { | |
| parent.postMessage("grand_child_loaded", "*"); | |
| }); | |
| window.addEventListener("message", event => { | |
| if (event.data == "report_focus_state") { | |
| let msg = got_focus ? "grand_child_is_focused" : "grand_child_is_not_focused"; | |
| parent.postMessage(msg, "*"); | |
| } | |
| }); | |
| </script> |