--- a/layout/reftests/svg/clipPath-polygon-elementFromPoint-01.svg
+++ b/layout/reftests/svg/clipPath-polygon-elementFromPoint-01.svg
@@ -16,21 +16,21 @@
   <script>
     function testElementFromPoint() {
       let inCount = 0, outCount = 0, inElem, outElem;
       document.getElementById("in").style.fill = "red";
       document.getElementById("out").style.fill = "blue";
 
       inElem = document.elementFromPoint(100, 100);
       if (inElem.style.fill == "red") { ++inCount; }
-      inElem = document.elementFromPoint(150, 100);
+      inElem = document.elementFromPoint(149, 100);
       if (inElem.style.fill == "red") { ++inCount; }
-      inElem = document.elementFromPoint(150, 150);
+      inElem = document.elementFromPoint(149, 149);
       if (inElem.style.fill == "red") { ++inCount; }
-      inElem = document.elementFromPoint(100, 150);
+      inElem = document.elementFromPoint(100, 149);
       if (inElem.style.fill == "red") { ++inCount; }
       if (inCount == 4) { document.getElementById("in").style.fill = "lime"; }
 
       outElem = document.elementFromPoint(99, 100);
       if (outElem.style.fill == "blue") { ++outCount; }
       outElem = document.elementFromPoint(150, 99);
       if (outElem.style.fill == "blue") { ++outCount; }
       outElem = document.elementFromPoint(151, 150);