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<!DOCTYPE html>
<script src="/common/get-host-info.sub.js"></script>
<script src="/css/cssom-view/support/scroll-behavior.js"></script>
<style>
.spacer {
height: calc(100vh + 100px);
}
</style>
<div class="spacer"></div>
<iframe id="iframe"></iframe>
<script>
iframe.src = // secure port
get_host_info().HTTPS_NOTSAMESITE_ORIGIN + "/intersection-observer/resources/nested-cross-origin-grand-child-iframe.html";
window.addEventListener("message", async event => {
if (event.data == "scroll") {
iframe.scrollIntoView({ behavior: "instant" });
await waitForScrollEnd(document.scrollingElement);
window.parent.postMessage("scrollEnd", "*");
}
});
</script>