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+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" title="Mozilla" href="https://mozilla.org">
+<link rel="help" href="https://www.w3.org/TR/css-grid-1/#named-lines" title="5.1.1. Named Grid Lines: the '(&lt;custom-ident\&gt;*)' syntax">
+<link rel="help" href="https://www.w3.org/TR/css-grid-1/#valdef-repeat-auto-fill" title="7.2.2.2. Repeat-to-fill: 'auto-fill' and 'auto-fit' repetitions">
+<style>
+
+.holder {
+  width: 300px;
+  height: 20px;
+  border-bottom: 2px solid #cfbfcf;
+}
+
+.holder > :nth-child(2) {
+  clear: left; /* Forces the div to a new line to simulate a new grid row. */
+  padding-top: 2px; /* Simulates the grid row gap. */
+}
+
+.grid-container > * { float: left; height: 8px; }
+
+.grid-container > :nth-child(3n)   {  background: sienna; }
+.grid-container > :nth-child(3n+1) {  background: gold; }
+.grid-container > :nth-child(3n+2) {  background: orange; }
+
+.alt-color > :nth-child(2n) { background: sienna; }
+.alt-color > :nth-child(2n+1) { background: orange; }
+
+.invis { width: 0px; visibility: none; }
+
+</style>
+
+<p>The test passes if it has the same visual effect as reference.</p>
+
+<div class="holder">
+  <div class="grid-container">
+    <div style="width:30px; margin-left:30px"></div>
+    <div style="width:30px;"></div>
+    <div style="width:40px;"></div>
+    <div style="width:50px;"></div>
+    <div style="width:60px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div style="width:10px;"></div>
+    <div style="width:30px; margin-left:20px"></div>
+    <div style="width:30px;"></div>
+    <div style="width:40px;"></div>
+    <div style="width:50px;"></div>
+    <div style="width:60px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div style="width:30px; margin-left:30px"></div>
+    <div style="width:50px;"></div>
+    <div style="width:60px;"></div>
+  </div>
+  <div class="grid-container">
+    <div style="width:10px"></div>
+    <div style="width:20px"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div style="width:10px;"></div>
+    <div style="width:30px; margin-left:20px;"></div>
+    <div style="width:50px;"></div>
+    <div style="width:60px;"></div>
+  </div>
+  <div class="grid-container">
+    <div class="invis"></div>
+    <div style="width:10px"></div>
+    <div style="width:20px"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div style="width:50px; margin-left:10px;"></div>
+    <div style="width:40px;"></div>
+    <div style="width:30px;"></div>
+    <div style="width:40px;"></div>
+    <div style="width:50px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div style="width:90px; margin-left:10px;"></div>
+    <div style="width:30px;"></div>
+    <div style="width:40px;"></div>
+    <div style="width:50px;"></div>
+    <div style="width:60px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div class="invis"></div>
+    <div style="width:10px;"></div>
+    <div class="invis"></div>
+    <div style="width:90px;"></div>
+    <div class="invis"></div>
+    <div style="width:30px;"></div>
+    <div style="width:40px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container alt-color">
+    <div class="invis"></div>
+    <div style="width:10px;"></div>
+    <div style="width:120px;"></div>
+    <div style="width:40px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div style="width:10px;"></div>
+    <div style="width:90px;"></div>
+    <div style="width:30px;"></div>
+    <div style="width:40px;"></div>
+    <div style="width:50px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div class="invis"></div>
+    <div style="width:10px;"></div>
+    <div class="invis"></div>
+    <div style="width:50px;"></div>
+    <div class="invis"></div>
+    <div style="width:40px;"></div>
+    <div style="width:30px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container alt-color">
+    <div class="invis"></div>
+    <div style="width:10px;"></div>
+    <div style="width:90px;"></div>
+    <div style="width:30px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div style="width:10px;"></div>
+    <div style="width:50px;"></div>
+    <div style="width:40px;"></div>
+    <div style="width:30px;"></div>
+    <div style="width:40px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div style="width:10px;"></div>
+    <div style="width:20px;"></div>
+    <div style="width:140px;"></div>
+    <div style="width:50px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div style="width:10px;"></div>
+    <div class="invis"></div>
+    <div style="width:20px;"></div>
+    <div class="invis"></div>
+    <div style="width:140px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container alt-color">
+    <div style="width:30px;"></div>
+    <div style="width:140px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div class="invis"></div>
+    <div style="width:10px;"></div>
+    <div class="invis"></div>
+    <div style="width:140px; margin-left:20px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div style="width:10px;"></div>
+    <div style="width:210px;"></div>
+    <div style="width:60px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container alt-color">
+    <div style="width:10px;"></div>
+    <div style="width:210px;"></div>
+    <div style="width:60px;"></div>
+  </div>
+</div>
+
+<div class="holder">
+  <div class="grid-container">
+    <div class="invis"></div>
+    <div style="width:10px;"></div>
+    <div class="invis"></div>
+    <div style="width:210px;"></div>
+  </div>
+</div>
+