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<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>
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