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diff --git a/testing/web-platform/tests/css/css-grid/abspos/grid-abspos-staticpos-justify-self-rtl-last-baseline-004.html b/testing/web-platform/tests/css/css-grid/abspos/grid-abspos-staticpos-justify-self-rtl-last-baseline-004.html
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+++ b/testing/web-platform/tests/css/css-grid/abspos/grid-abspos-staticpos-justify-self-rtl-last-baseline-004.html
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+<!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 Test: Static position of abspos LTR children in a RTL static-pos grid container, with various "justify-self" values</title>
+  <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
+  <link rel="help" href="https://drafts.csswg.org/css-grid/#abspos-items">
+  <link rel="match" href="grid-abspos-staticpos-justify-self-rtl-last-baseline-004-ref.html">
+  <style>
+    .container {
+      display: grid;
+      direction: rtl;
+      padding: 2px 1px;
+      border: 1px solid black;
+      background: yellow;
+      margin-bottom: 5px;
+      margin-right: 5px;
+      float: left; /* For testing in "rows" of containers */
+    }
+    br { clear: both }
+
+    .big > .container {
+      width: 30px;
+      height: 22px;
+      grid: 3px 14px 3px / 2px 20px 2px;
+    }
+    .small > .container {
+      grid: 3px 2px 3px / 0px 2px 0px;
+      width: 2px;
+      height: 4px;
+      margin-right: 10px; /* To avoid overlap between overflowing kids */
+    }
+
+    .container > * {
+      position: absolute;
+      direction: ltr;
+      grid-area: 2 / 2 / 3 / 3;
+      background: teal;
+      width: 6px;
+      height: 8px;
+    }
+  </style>
+</head>
+<body>
+  <!-- The last baseline value, from
+       https://www.w3.org/TR/css-align-3/#propdef-justify-self -->
+  <div class="big">
+    <div class="container"><div style="justify-self: last baseline"></div></div>
+  </div>
+  <div class="small">
+    <div class="container"><div style="justify-self: last baseline"></div></div>
+  </div>
+</body>
+</html>