third_party/blink/web_tests/svg/filters/feMorphology-negative-radius.html - chromium/src - Git at Google

 <!DOCTYPE html>
 <svg>
     <filter id="dilate">
         <feMorphology operator="dilate" radius="-1"/>
     </filter>
     <rect width="100" height="100" fill="green" filter="url(#dilate)"/>

     <filter id="erode">
         <feMorphology operator="erode" radius="-1"/>
     </filter>
     <rect width="100" height="100" fill="green" filter="url(#erode)" x="100"/>
 </svg>
	<!DOCTYPE html>
	<svg>
	<filter id="dilate">
	<feMorphology operator="dilate" radius="-1"/>
	</filter>
	<rect width="100" height="100" fill="green" filter="url(#dilate)"/>

	<filter id="erode">
	<feMorphology operator="erode" radius="-1"/>
	</filter>
	<rect width="100" height="100" fill="green" filter="url(#erode)" x="100"/>
	</svg>