chromium/src/third_party/blink/web_tests/svg/custom/pattern-within-other-pattern.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE html>
 <svg width="100" height="100">
   <pattern id="outer" width="1" height="1">
     <pattern id="inner" width="1" height="1">
       <rect width="100" height="100" fill="url(#outer)"/>
     </pattern>
     <rect width="100" height="100" fill="green"/>
   </pattern>
   <rect width="100" height="100" fill="url(#inner)"/>
 </svg>
	<!DOCTYPE html>
	<svg width="100" height="100">
	<pattern id="outer" width="1" height="1">
	<pattern id="inner" width="1" height="1">
	<rect width="100" height="100" fill="url(#outer)"/>
	</pattern>
	<rect width="100" height="100" fill="green"/>
	</pattern>
	<rect width="100" height="100" fill="url(#inner)"/>
	</svg>