| <script> |
| /** |
| * Send a message to the opening browsing context when the document is |
| * "completely loaded" (a condition which occurs immediately after the `load` |
| * and `pageshow` events are fired). |
| * https://html.spec.whatwg.org/multipage/parsing.html#the-end |
| */ |
| 'use strict'; |
| |
| // The `pageshow` event is used instead of the `load` event because this |
| // document may itself be accessed via history traversal. In such cases, the |
| // browser may choose to reuse a cached document and therefore fire no |
| // additional `load` events. |
| addEventListener('pageshow', () => { |
| setTimeout(() => opener.postMessage(null, '*'), 0); |
| }); |
| </script> |
