diff --git a/css/motion/parsing/offset-path-parsing-valid.html b/css/motion/parsing/offset-path-parsing-valid.html
index 59a64b2116d603..69acc9291f9274 100644
--- a/css/motion/parsing/offset-path-parsing-valid.html
+++ b/css/motion/parsing/offset-path-parsing-valid.html
@@ -44,10 +44,12 @@
 
 test_valid_value("offset-path", 'url("http://www.example.com/index.html#polyline1")');
 
-test_valid_value("offset-path", "circle(100px)", "circle(100px at 50% 50%)");
-test_valid_value("offset-path", "margin-box");
+test_valid_value("offset-path", "circle(100px)");
+test_valid_value("offset-path", "circle(100px at 50% 50%)");
+test_valid_value("offset-path", "border-box");
 test_valid_value("offset-path", "inset(10% 20% 30% 40%) border-box");
 test_valid_value("offset-path", "fill-box ellipse(50% 60%)", "ellipse(50% 60%) fill-box");
+test_valid_value("offset-path", "content-box ellipse(50% 60% at 50% 50%)", "ellipse(50% 60% at 50% 50%) content-box");
 </script>
 </body>
 </html>