third_party/blink/web_tests/paint/clipath/clip-path-bigger-than-visual-overflow.html - chromium/src - Git at Google

 <!DOCTYPE html>
 <svg style="position:absolute;">
   <defs>
     <clipPath id="path">
       <rect x="50" y="50" width="400" height="400"/>
       <!-- Adding an empty text node to force mask-based clipping. -->
       <text></text>
     </clipPath>
   </defs>
 </svg>
 <div style="position:absolute; left:0; top:0; width:10px; height:10px; clip-path:url(#path);">
   <div style="width:100px; height:100px; background:green;"></div>
 </div>
 This test verifies the kSrcIn layer of the clipped contents be at least as big
 as the clip mask layer, so the clip mask doesn't leak out.
	<!DOCTYPE html>
	<svg style="position:absolute;">
	<defs>
	<clipPath id="path">
	<rect x="50" y="50" width="400" height="400"/>
	<!-- Adding an empty text node to force mask-based clipping. -->
	<text></text>
	</clipPath>
	</defs>
	</svg>
	<div style="position:absolute; left:0; top:0; width:10px; height:10px; clip-path:url(#path);">
	<div style="width:100px; height:100px; background:green;"></div>
	</div>
	This test verifies the kSrcIn layer of the clipped contents be at least as big
	as the clip mask layer, so the clip mask doesn't leak out.