chromium/src/third_party/blink/web_tests/compositing/overflow/fixed-pos-escape-clip-having-non-stacking-context-clipping-container.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE html>
 This test verifies fixed-pos element escapes clip correctly, even if its true clipping container is not a stacking context.
 It succeeds if a 50x50 green box is shown below.
 <div style="overflow:hidden; width:100px; height:100px;">
   <div style="transform:translateX(0); width:100px; height:100px;">
     <div style="position:relative; width:10px; height:10px; overflow:hidden;">
       <div style="will-change:transform;">Promote</div>
       <div style="position:absolute; z-index:0; top:0; left:0; width:300px; height:200px;">
         <div style="position:fixed; left:0; top:0; width:50px; height:50px; background:green;">
         </div>
       </div>
     </div>
   </div>
 </div>
	<!DOCTYPE html>
	This test verifies fixed-pos element escapes clip correctly, even if its true clipping container is not a stacking context.
	It succeeds if a 50x50 green box is shown below.
	<div style="overflow:hidden; width:100px; height:100px;">
	<div style="transform:translateX(0); width:100px; height:100px;">
	<div style="position:relative; width:10px; height:10px; overflow:hidden;">
	<div style="will-change:transform;">Promote</div>
	<div style="position:absolute; z-index:0; top:0; left:0; width:300px; height:200px;">
	<div style="position:fixed; left:0; top:0; width:50px; height:50px; background:green;">
	</div>
	</div>
	</div>
	</div>
	</div>