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

<style>
div {
  background-color: yellow;
  height: 500px;
  width: 100px;
}
</style>

<div></div>
<button id="btn">Click</button>
<div></div>

<script>
document.getElementById("btn").scrollIntoView();
document.getElementById("btn").scrollIntoView();
</script>