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diff --git a/testing/web-platform/tests/css/css-grid/placement/grid-auto-placement-implicit-tracks-001.html b/testing/web-platform/tests/css/css-grid/placement/grid-auto-placement-implicit-tracks-001.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Grid items auto-placement implicit tracks</title>
+<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
+<link rel="help" href="https://drafts.csswg.org/css-grid-1/#auto-placement-algo">
+<meta name="assert" content="This test checks that auto-placement works properly even when implicit tracks have been created during the first steps of the placement algorithm.">
+<style>
+.grid {
+    display: grid;
+    position: relative;
+    grid-auto-columns: 100px;
+    grid-auto-rows: 50px;
+    margin: 10px;
+}
+.gridAutoFlowColumn { grid-auto-flow: column; }
+.gridAutoFlowColumnDense { grid-auto-flow: column dense; }
+.gridAutoFlowRowDense { grid-auto-flow: row dense; }
+.grid > div { border: solid; }
+</style>
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+
+<body onload="checkLayout('.grid')">
+<div id="log"></div>
+
+<div class="grid">
+  <div data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="50">i1</div>
+  <div style="grid-column: span 2; grid-row: span 2;"
+      data-offset-x="0" data-offset-y="50" data-expected-width="200" data-expected-height="100">i2</div>
+  <div data-offset-x="0" data-offset-y="150" data-expected-width="100" data-expected-height="50">i3</div>
+  <div data-offset-x="100" data-offset-y="150" data-expected-width="100" data-expected-height="50">i4</div>
+</div>
+
+<div class="grid">
+  <div data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="50">i1</div>
+  <div style="grid-column: 1; grid-row: span 2;"
+      data-offset-x="0" data-offset-y="50" data-expected-width="100" data-expected-height="100">i2</div>
+  <div data-offset-x="0" data-offset-y="150" data-expected-width="100" data-expected-height="50">i3</div>
+  <div data-offset-x="0" data-offset-y="200" data-expected-width="100" data-expected-height="50">i4</div>
+</div>
+
+<div class="grid">
+  <div data-offset-x="0" data-offset-y="50" data-expected-width="100" data-expected-height="50">i1</div>
+  <div style="grid-column: span 2; grid-row: 1;"
+      data-offset-x="0" data-offset-y="0" data-expected-width="200" data-expected-height="50">i2</div>
+  <div data-offset-x="100" data-offset-y="50" data-expected-width="100" data-expected-height="50">i3</div>
+  <div data-offset-x="0" data-offset-y="100" data-expected-width="100" data-expected-height="50">i4</div>
+</div>
+
+<div class="grid gridAutoFlowRowDense">
+  <div data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="50">i1</div>
+  <div style="grid-column: span 2; grid-row: span 2;"
+      data-offset-x="0" data-offset-y="50" data-expected-width="200" data-expected-height="100">i2</div>
+  <div data-offset-x="100" data-offset-y="0" data-expected-width="100" data-expected-height="50">i3</div>
+  <div data-offset-x="0" data-offset-y="150" data-expected-width="100" data-expected-height="50">i4</div>
+</div>
+
+<div class="grid gridAutoFlowRowDense">
+  <div data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="50">i1</div>
+  <div style="grid-column: 1; grid-row: span 2;"
+      data-offset-x="0" data-offset-y="50" data-expected-width="100" data-expected-height="100">i2</div>
+  <div data-offset-x="0" data-offset-y="150" data-expected-width="100" data-expected-height="50">i3</div>
+  <div data-offset-x="0" data-offset-y="200" data-expected-width="100" data-expected-height="50">i4</div>
+</div>
+
+<div class="grid gridAutoFlowRowDense">
+  <div data-offset-x="0" data-offset-y="50" data-expected-width="100" data-expected-height="50">i1</div>
+  <div style="grid-column: span 2; grid-row: 1;"
+      data-offset-x="0" data-offset-y="0" data-expected-width="200" data-expected-height="50">i2</div>
+  <div data-offset-x="100" data-offset-y="50" data-expected-width="100" data-expected-height="50">i3</div>
+  <div data-offset-x="0" data-offset-y="100" data-expected-width="100" data-expected-height="50">i4</div>
+</div>
+
+<div class="grid gridAutoFlowColumn">
+  <div data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="50">i1</div>
+  <div style="grid-column: span 2; grid-row: span 2;"
+      data-offset-x="100" data-offset-y="0" data-expected-width="200" data-expected-height="100">i2</div>
+  <div data-offset-x="300" data-offset-y="0" data-expected-width="100" data-expected-height="50">i3</div>
+  <div data-offset-x="300" data-offset-y="50" data-expected-width="100" data-expected-height="50">i4</div>
+</div>
+
+<div class="grid gridAutoFlowColumn">
+  <div data-offset-x="100" data-offset-y="0" data-expected-width="100" data-expected-height="50">i1</div>
+  <div style="grid-column: 1; grid-row: span 2;"
+      data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="100">i2</div>
+  <div data-offset-x="100" data-offset-y="50" data-expected-width="100" data-expected-height="50">i3</div>
+  <div data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="50">i4</div>
+</div>
+
+<div class="grid gridAutoFlowColumn">
+  <div data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="50">i1</div>
+  <div style="grid-column: span 2; grid-row: 1;"
+      data-offset-x="100" data-offset-y="0" data-expected-width="200" data-expected-height="50">i2</div>
+  <div data-offset-x="300" data-offset-y="0" data-expected-width="100" data-expected-height="50">i3</div>
+  <div data-offset-x="400" data-offset-y="0" data-expected-width="100" data-expected-height="50">i4</div>
+</div>
+
+<div class="grid gridAutoFlowColumnDense">
+  <div data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="50">i1</div>
+  <div style="grid-column: span 2; grid-row: span 2;"
+      data-offset-x="100" data-offset-y="0" data-expected-width="200" data-expected-height="100">i2</div>
+  <div data-offset-x="0" data-offset-y="50" data-expected-width="100" data-expected-height="50">i3</div>
+  <div data-offset-x="300" data-offset-y="0" data-expected-width="100" data-expected-height="50">i4</div>
+</div>
+
+<div class="grid gridAutoFlowColumnDense">
+  <div data-offset-x="100" data-offset-y="0" data-expected-width="100" data-expected-height="50">i1</div>
+  <div style="grid-column: 1; grid-row: span 2;"
+      data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="100">i2</div>
+  <div data-offset-x="100" data-offset-y="50" data-expected-width="100" data-expected-height="50">i3</div>
+  <div data-offset-x="200" data-offset-y="0" data-expected-width="100" data-expected-height="50">i4</div>
+</div>
+
+<div class="grid gridAutoFlowColumnDense">
+  <div data-offset-x="0" data-offset-y="0" data-expected-width="100" data-expected-height="50">i1</div>
+  <div style="grid-column: span 2; grid-row: 1;"
+      data-offset-x="100" data-offset-y="0" data-expected-width="200" data-expected-height="50">i2</div>
+  <div data-offset-x="300" data-offset-y="0" data-expected-width="100" data-expected-height="50">i3</div>
+  <div data-offset-x="400" data-offset-y="0" data-expected-width="100" data-expected-height="50">i4</div>
+</div>
+
+</body>