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+++ b/testing/web-platform/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-explicit-block-ref.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+    <meta charset="utf-8">
+    <title>CSS Grid Reference: Verify definite blocks effect track-sizing algorithm.</title>
+</head>
+
+<body>
+<style>
+grid {
+    display: grid;
+    grid-template-columns: auto 1fr;
+    grid-template-rows: 50px 50px;
+    width: 300px;
+    height: 100px;
+}
+
+box1 {
+    height: 50px;
+    width: 30px;
+    background-color: blue;
+}
+
+box2 {
+    height: 50px;
+    background-color: red;
+}
+
+box3 {
+    height: 50px;
+    width: 100px;
+    grid-row: 2;
+    grid-column: 1;
+    background-color: purple;
+}
+
+box4 {
+    height: 50px;
+    background-color: green;
+}
+
+</style>
+
+<grid>
+    <box1>1</box1>
+    <box2>2</box2>
+    <box3>3</box3>
+    <box4>4</box4>
+</grid>
+
+</body>
+</html>