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+
+<!DOCTYPE html>
+<html lang=en class="reftest-wait">
+<meta charset="utf-8">
+<title>CSS Grid Layout Test: Grid positioned item dynamic change</title>
+<link rel="help" href="https://drafts.csswg.org/css-grid-2/#abspos">
+<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
+<meta name="assert" content="This test checks that descendant positioned items can be dynamically changed.">
+<style>
+.grid {
+  display: grid;
+  grid: 50px 50px / 50px 50px;
+  position: relative;
+}
+
+.green {
+  background: green;
+}
+
+.red {
+  background: red;
+}
+
+#item {
+  position: absolute;
+  width: 100%;
+  height: 100%;
+  grid-column: 1 / 2;
+  grid-row: 1 / 2;
+  top: 0;
+}
+</style>
+
+<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
+
+<div class="grid">
+  <div class="green"></div>
+  <div class="green">
+    <div id="item" class="green"></div>
+  </div>
+  <div class="green"></div>
+  <div class="red"></div>
+</div>
+
+<script>
+  document.body.offsetLeft;
+
+  var item = document.getElementById("item");
+  item.style.gridColumn = "2 / 3";
+  item.style.gridRow = "2 / 3";
+
+  document.documentElement.classList.remove('reftest-wait');
+</script>
+
+</html>