query-target-in-load-event.part.html

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<!-- Used by ./query-target-in-load-event.html -->

<script>

  window.onload = function() {

    let target = document.querySelector(":target");

    let expected = document.querySelector("#target");

    window.parent.postMessage(target == expected ? "PASS" : "FAIL", "*");

};

</script>

<div id="target"></div>