chromium/src/third_party/blink/web_tests/compositing/overflow/escape-clip-and-paint-before-clip-parent.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE html>
 This test succeeds if a box escapes clip from a clipped stacking context
 correctly while its clipping container paints after it.
 <div style="overflow:hidden; width:100px; height:100px;">
   <div style="will-change:opacity;">
     <div style="position:absolute; overflow:hidden; width:200px; height:200px; background:blue;">
       <div style="position:relative; z-index:-1; width:250px; height:250px; background:green; will-change:opacity;">
       </div>
     </div>
   </div>
 </div>
	<!DOCTYPE html>
	This test succeeds if a box escapes clip from a clipped stacking context
	correctly while its clipping container paints after it.
	<div style="overflow:hidden; width:100px; height:100px;">
	<div style="will-change:opacity;">
	<div style="position:absolute; overflow:hidden; width:200px; height:200px; background:blue;">
	<div style="position:relative; z-index:-1; width:250px; height:250px; background:green; will-change:opacity;">
	</div>
	</div>
	</div>
	</div>