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chromium/third_party/blink/web_tests/fast/scroll-behavior/scroll-iframe-into-view-twice.html 

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>

<style>
div {
  overflow: scroll;
  height: 260px;
  width: 420px;
}
iframe {
  height: 250px;
  width: 400px;
  margin-top: 400px;
}
</style>

<div id="div">
  <iframe id="iframe" src="resources/scroll-into-view-twice-iframe.html"></iframe>
</div>

<script>
promise_test(t => {
  var iframe = document.getElementById("iframe");
  var div = document.getElementById("div");
  return new Promise(function (resolve) {
    iframe.addEventListener("load", function() {
      resolve();
    });
  }).then(() => {
    assert_greater_than(div.scrollTop, 380);
  });
});
</script>