chromium/src/third_party/blink/web_tests/fast/scroll-behavior/resources/scroll-into-view-twice-iframe.html - manifest_repos/chromium_src - Git at Google

 <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>
	<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>