third_party/blink/web_tests/fragmentation/auto-overflow.html - chromium/src - Git at Google

 <!DOCTYPE html>
 <p>There should be a hotpink square below.</p>
 <div id="multicol" style="columns:3; column-fill:auto; column-gap:0; height:50px;">
     <div style="overflow:auto; height:100px; background:hotpink;"></div>
 </div>
 <script>
   document.body.offsetTop;
   document.getElementById("multicol").style.width = "75px";
 </script>
	<!DOCTYPE html>
	<p>There should be a hotpink square below.</p>
	<div id="multicol" style="columns:3; column-fill:auto; column-gap:0; height:50px;">
	<div style="overflow:auto; height:100px; background:hotpink;"></div>
	</div>
	<script>
	document.body.offsetTop;
	document.getElementById("multicol").style.width = "75px";
	</script>