1 files changed, 69 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-grid/subgrid/line-names-004.html b/testing/web-platform/tests/css/css-grid/subgrid/line-names-004.html
new file mode 100644
index 0000000000..84f727d2e3
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+++ b/testing/web-platform/tests/css/css-grid/subgrid/line-names-004.html
@@ -0,0 +1,69 @@
+<!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: subgrid item using mix of outer/inner line names</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="line-names-004-ref.html">
+  <style>
+html,body {
+  color:black; background-color:white; font:24px/1 monospace; padding:0; margin:0;
+}
+
+.grid {
+  display: grid;
+  grid: auto / [a] 50px 50px 50px 50px [b] 50px 50px [a b];
+  padding: 20px 10px;
+}
+
+.subgrid {
+  display: grid;
+  grid-template-columns:  subgrid [x] [b] [] [] [b];
+  grid-auto-rows: 10px;
+  grid-column: 2 / span 4;
+}
+
+x { background: grey; }
+
+  </style>
+</head>
+<body>
+
+<div class="grid">
+  <div class="subgrid">
+    <x style="grid-row:1; grid-column: b / b 2"></x>
+    <x style="grid-row:2; grid-column: b / b -1"></x>
+    <x style="grid-row:3; grid-column: b / b -2"></x>
+    <x style="grid-row:4; grid-column: b / span b"></x>
+    <x style="grid-row:5; grid-column: b / span b 2"></x>
+    <x style="grid-row:6; grid-column: span b / b 2"></x>
+    <x style="grid-row:7; grid-column: span b 2 / b 2"></x>
+    <x style="grid-row:8; grid-column: b -2 / b"></x>
+    <x style="grid-row:9; grid-column: b -3 / b"></x>
+    <x style="grid-row:10; grid-column: b / b"></x>
+    <x style="grid-row:11; grid-column: b / b 10"></x>
+    <x style="grid-row:12; grid-column: span b / b -2"></x>
+  </div>
+</div>
+
+<script>
+  const expectedResults = [
+    "subgrid [x] [b] [] [] [b]",
+  ];
+  [...document.querySelectorAll('.subgrid')].forEach(function(subgrid, i) {
+    let actual = window.getComputedStyle(subgrid)['grid-template-columns'];
+    let expected = expectedResults[i];
+    if (actual != expected) {
+      let err = "Unexpected getComputedStyle value for subgrid " + i + " with className '" + subgrid.className + "':" +
+      " Actual: \"" + actual + "\", Expected: \"" + expected + "\"";
+      document.body.appendChild(document.createTextNode(err));
+    }
+  });
+</script>
+
+</body>
+</html>