<!DOCTYPE html>
<script src='test-helpers.js'></script>
<script src='messaging-serialize-helpers.js'></script>
<script src='message-target.js'></script>
<script id="inline_script">
'use strict'
if (window.parent !== null && window.parent != window) {
window.parent.postMessage('LOADED', { targetOrigin: '*' });
}
if (window.opener !== null) {
window.opener.postMessage('LOADED', { targetOrigin: '*' });
}
// Use an undefined message target to send responses to
// MessageEvent::source instead.
const target = undefined;
add_message_event_handlers(
/*receiver=*/self, target, /*target_origin=*/'*');
</script>