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<!DOCTYPE html>
<script>
window._subframeloaded = false;
</script>
<iframe onload="window._subframeloaded = true"></iframe>
<script>
window.initialAboutBlankWasSync = window._subframeloaded;
</script>
<script>
window.onload = () => {
window.opener.postMessage("top ready", "*");
};
</script>