diff --git a/css/css-contain/contain-size-grid-003.html b/css/css-contain/contain-size-grid-003.html
new file mode 100644
index 00000000000000..e146b8859206bd
--- /dev/null
+++ b/css/css-contain/contain-size-grid-003.html
@@ -0,0 +1,200 @@
+
+
+CSS Containment Test: Size containment on grid containers
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+