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diff --git a/testing/web-platform/tests/css/css-grid/masonry/tentative/subgrid/masonry-subgrid-001.html b/testing/web-platform/tests/css/css-grid/masonry/tentative/subgrid/masonry-subgrid-001.html
new file mode 100644
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+++ b/testing/web-platform/tests/css/css-grid/masonry/tentative/subgrid/masonry-subgrid-001.html
@@ -0,0 +1,164 @@
+<!DOCTYPE HTML>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+  <meta charset="utf-8">
+  <title>CSS Grid Test: Masonry layout with a subgrid</title>
+  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
+  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
+  <link rel="match" href="masonry-subgrid-001-ref.html">
+<style>
+html,body {
+  color:black; background-color:white; font:16px/1 monospace; padding:0; margin:0;
+}
+
+grid {
+  display: inline-grid;
+  grid-template-rows: 50px 80px 40px;
+  grid-template-columns: masonry;
+  gap: 4px 2px;
+  padding: 1px 3px 5px 7px;
+  border: solid;
+  border-width: 3px 5px 1px 1px;
+  background: lightgrey content-box;
+}
+.rows {
+  grid-template-columns: 50px 80px 40px;
+  grid-template-rows: masonry;
+}
+item {
+  background: grey;
+  width: 3ch;
+  position: relative;
+}
+item:nth-child(2n) { background:purple; width:auto; }
+item:nth-child(1) {
+  border: solid;
+  border-width: 3px 13px 1px 1px;
+  margin: 7px 1px 5px 3px;
+}
+subgrid {
+  display: grid;
+  grid: subgrid / subgrid;
+  grid-row: 2 / span 2;
+  grid-gap: 8px 20px;
+  background: yellow;
+}
+.rows > subgrid {
+  grid-row: initial;
+  grid-column: 2 / span 2;
+}
+</style>
+</head>
+<body>
+
+<!-- just to sanity check that `masonry` behaves as `none` in the column axis in this case: -->
+<grid style="grid:masonry/masonry">
+  <item>1</item>
+  <item>2</item>
+  <item>3</item>
+  <subgrid>
+    <item>4a</item>
+    <item style="margin-right:15px">4b</item>
+  </subgrid>
+</grid>
+
+<grid>
+  <item>1</item>
+  <item>2</item>
+  <item>3</item>
+  <subgrid>
+    <item>4a</item>
+    <item>4b</item>
+    <item>4c</item>
+  </subgrid>
+  <item>5</item>
+</grid>
+
+<grid>
+  <item>1</item>
+  <item>2</item>
+  <item>3</item>
+  <subgrid style="grid:subgrid/auto">
+    <item>4a</item>
+    <item>4b</item>
+    <item>4c</item>
+  </subgrid>
+  <item>5</item>
+</grid>
+
+<grid>
+  <item>1</item>
+  <item>2</item>
+  <item>3</item>
+  <subgrid style="grid:subgrid/auto; grid-auto-flow:column">
+    <item>4a</item>
+    <item>4b</item>
+    <item>4c</item>
+  </subgrid>
+  <item>5</item>
+</grid>
+
+<grid>
+  <item>1</item>
+  <item>2</item>
+  <item>3</item>
+  <subgrid style="grid:auto auto/subgrid">
+    <item>4a</item>
+    <item>4b</item>
+    <item>4c</item>
+  </subgrid>
+  <item>5</item>
+</grid>
+
+<grid class="rows">
+  <item>1</item>
+  <item>2</item>
+  <item>3</item>
+  <subgrid>
+    <item>4a</item>
+    <item>4b</item>
+    <item>4c</item>
+  </subgrid>
+  <item>5</item>
+</grid>
+
+<grid class="rows">
+  <item>1</item>
+  <item>2</item>
+  <item>3</item>
+  <subgrid style="grid:auto/subgrid">
+    <item>4a</item>
+    <item>4b</item>
+    <item>4c</item>
+  </subgrid>
+  <item>5</item>
+</grid>
+
+<grid class="rows">
+  <item>1</item>
+  <item>2</item>
+  <item>3</item>
+  <subgrid style="grid:auto/subgrid; grid-auto-flow:column">
+    <item>4a</item>
+    <item>4b</item>
+    <item>4c</item>
+  </subgrid>
+  <item>5</item>
+</grid>
+
+<grid class="rows">
+  <item>1</item>
+  <item>2</item>
+  <item>3</item>
+  <subgrid style="grid:auto auto/subgrid">
+    <item>4a</item>
+    <item>4b</item>
+    <item>4c</item>
+  </subgrid>
+  <item>5</item>
+</grid>
+
+</body></html>