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diff --git a/testing/web-platform/tests/css/css-grid/layout-algorithm/grid-intrinsic-track-sizes-001.html b/testing/web-platform/tests/css/css-grid/layout-algorithm/grid-intrinsic-track-sizes-001.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Intrinsic contribution of a small item to intrinsic tracks</title>
+<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact">
+<link rel="help" href="https://www.w3.org/TR/css-grid-1/#algo-content">
+<meta name="assert" content="This test checks that the intrinsic contribution of a single grid item smaller than its container is distributed correctly among the tracks it spans when intrinsic tracks are involved.">
+<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
+<style>
+#grid {
+  display: grid;
+  width: 120px;
+  height: 120px;
+  border: solid;
+  font: 10px/1 Ahem;
+}
+#item {
+  background: blue;
+  /* make min-content contribution differ from minimum contribution */
+  min-width: 12px;
+  min-height: 12px;
+}
+</style>
+
+<div id="grid">
+  <div id="item">XXX XX<br>XX<br>XX</div>
+</div>
+
+<div id="log"></div>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../grid-definition/support/testing-utils.js"></script>
+<script>
+const item = document.getElementById("item");
+function checkTrackSizes(span, trackList, expectedCols, expectedRows) {
+  item.style.gridColumn = item.style.gridRow = `span ${span}`;
+  if (!expectedRows) {
+    expectedRows = expectedCols;
+  }
+  TestingUtils.testGridTemplateColumnsRows("grid", trackList, trackList, expectedCols, expectedRows);
+}
+
+setup({ explicit_done: true });
+document.fonts.ready.then(() => {
+  // Item spanning a single track
+  checkTrackSizes(1, "auto", "120px");
+  checkTrackSizes(1, "min-content", "30px", "40px");
+  checkTrackSizes(1, "max-content", "60px", "30px");
+
+  checkTrackSizes(1, "minmax(0, auto)", "120px");
+  checkTrackSizes(1, "minmax(0, min-content)", "30px", "40px");
+  checkTrackSizes(1, "minmax(0, max-content)", "60px", "30px");
+
+  checkTrackSizes(1, "minmax(auto, 10px)", "12px");
+  checkTrackSizes(1, "minmax(min-content, 10px)", "30px", "40px");
+  checkTrackSizes(1, "minmax(max-content, 10px)", "60px", "30px");
+
+  // Item spanning two identical tracks
+
+  checkTrackSizes(2, "auto auto", "60px 60px");
+  checkTrackSizes(2, "min-content min-content", "15px 15px", "20px 20px");
+  checkTrackSizes(2, "max-content max-content", "30px 30px", "15px 15px");
+
+  checkTrackSizes(2, "minmax(0, auto) minmax(0, auto)", "60px 60px");
+  checkTrackSizes(2, "minmax(0, min-content) minmax(0, min-content)", "15px 15px", "20px 20px");
+  checkTrackSizes(2, "minmax(0, max-content) minmax(0, max-content)", "30px 30px", "15px 15px");
+
+  checkTrackSizes(2, "minmax(auto, 4px) minmax(auto, 4px)", "6px 6px");
+  checkTrackSizes(2, "minmax(auto, 10px) minmax(auto, 10px)", "10px 10px");
+  checkTrackSizes(2, "minmax(min-content, 10px) minmax(min-content, 10px)", "15px 15px", "20px 20px");
+  checkTrackSizes(2, "minmax(max-content, 10px) minmax(max-content, 10px)", "30px 30px", "15px 15px");
+
+  // Item spanning a fixed track also
+  checkTrackSizes(2, "20px auto", "20px 100px");
+  checkTrackSizes(2, "20px min-content", "20px 10px", "20px 20px");
+  checkTrackSizes(2, "20px max-content", "20px 40px", "20px 10px");
+
+  checkTrackSizes(2, "20px minmax(0, auto)", "20px 100px");
+  checkTrackSizes(2, "20px minmax(0, min-content)", "20px 10px", "20px 20px");
+  checkTrackSizes(2, "20px minmax(0, max-content)", "20px 40px", "20px 10px");
+
+  checkTrackSizes(2, "20px minmax(auto, 30px)", "20px 30px");
+  checkTrackSizes(2, "20px minmax(min-content, 6px)", "20px 10px", "20px 20px");
+  checkTrackSizes(2, "20px minmax(min-content, 40px)", "20px 40px", "20px 40px");
+  checkTrackSizes(2, "20px minmax(max-content, 6px)", "20px 40px", "20px 10px");
+  checkTrackSizes(2, "20px minmax(max-content, 30px)", "20px 40px", "20px 30px");
+
+  // Item spanning two mismatched intrinsic tracks
+  checkTrackSizes(2, "max-content min-content", "45px 15px", "15px 15px");
+
+  done();
+});
+</script>