chromium/src/third_party/blink/web_tests/compositing/overflow/border-radius-outside-bounds-of-compositing-ancestor.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE html>
 <!-- Passes if there is a blue rounded-corner rect below the gray one -->
 <div style="width: 200px; height: 200px; isolation: isolate; will-change: transform; background: lightgray">
   <div id=border-radius style="border-radius: 10px; overflow: hidden; position: relative; top: 300px; width: 100px; height: 100px;">
     <div id=child style="width: 100px; height: 100px; background: lightblue; will-change: transform"></div>
   </div>
 </div>
	<!DOCTYPE html>
	<!-- Passes if there is a blue rounded-corner rect below the gray one -->
	<div style="width: 200px; height: 200px; isolation: isolate; will-change: transform; background: lightgray">
	<div id=border-radius style="border-radius: 10px; overflow: hidden; position: relative; top: 300px; width: 100px; height: 100px;">
	<div id=child style="width: 100px; height: 100px; background: lightblue; will-change: transform"></div>
	</div>
	</div>