File: scroll-margin-propagation-iframe-2.html

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<!DOCTYPE html>

<script src="/common/get-host-info.sub.js"></script>

<p>Iframe 2</p>

<div style="width: 200px; height: 200px; overflow-y: scroll; outline: 1px solid purple" id="scroller">
  <!-- Spacer to trigger scrolling -->
  <div style="height: 300px"></div>

  <iframe id="iframe" width=150 height=200></iframe>
</div>

<script>
  iframe.src = get_host_info().ORIGIN + "/intersection-observer/resources/scroll-margin-propagation-iframe-3.html";

  window.addEventListener("message", event => {
    const data = event.data;

    if (data.msgName === "setScrollTop" && data.target === "iframe2") {
        scroller.scrollTop = data.scrollTop;
        window.top.postMessage({ msgName: "scrollEnd", source: "iframe2" }, "*");
    }
});
</script>