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+++ b/testing/web-platform/tests/css/css-grid/masonry/tentative/track-sizing/masonry-track-sizing-explicit-block.html
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+<!DOCTYPE html>
+<html>
+
+<head>
+    <meta charset="utf-8">
+    <title>CSS Grid Test: Verify definite blocks effect track-sizing algorithm.</title>
+    <link rel="author" title="Brandon Stewart" href="mailto:brandonstewart@apple.com">
+    <link rel="help" href="https://drafts.csswg.org/css-grid-3/#track-sizing">
+    <link rel="match" href="masonry-track-sizing-explicit-block-ref.html">
+</head>
+
+<body>
+<style>
+    grid {
+        display: grid;
+        grid-template-columns: 100px 1fr;
+        grid-template-rows: masonry;
+        width: 300px;
+        height: 100px;
+    }
+
+    box1 {
+        height: 50px;
+        width: 30px;
+        background-color: blue;
+    }
+
+    box2 {
+        height: 50px;
+        background-color: red;
+    }
+
+    box3 {
+        height: 50px;
+        width: 100px;
+        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>