chromium/src/third_party/blink/web_tests/fast/borders/border-radius-with-composited-child.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE HTML>
 <p>Below there should be a solid green circle with a black border and no red.</p>
 <br>
 <div style="position:relative; z-index:1; overflow:hidden; margin-top:100px; width:200px; height:200px; border-radius:50%; border:10px solid black; background:red;">
     <div style="will-change: transform; width:300px; height:300px; margin-left:-50px; margin-top:-50px; background:green;"></div>
 </div>
	<!DOCTYPE HTML>
	<p>Below there should be a solid green circle with a black border and no red.</p>
	<br>
	<div style="position:relative; z-index:1; overflow:hidden; margin-top:100px; width:200px; height:200px; border-radius:50%; border:10px solid black; background:red;">
	<div style="will-change: transform; width:300px; height:300px; margin-left:-50px; margin-top:-50px; background:green;"></div>
	</div>