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diff --git a/testing/web-platform/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-content-baseline-001-ref.html b/testing/web-platform/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-content-baseline-001-ref.html
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+++ b/testing/web-platform/tests/css/css-grid/masonry/tentative/baseline/masonry-grid-item-content-baseline-001-ref.html
@@ -0,0 +1,88 @@
+<!DOCTYPE HTML>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+  <meta charset="utf-8">
+  <title>Reference: align-content:baseline/last baseline</title>
+  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
+  <link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
+  <style>
+html,body {
+    color:black; background-color:white; font:15px/1 Ahem; padding:0; margin:0;
+}
+
+.grid {
+  float: left;
+  display: grid;
+  grid: auto / repeat(4, auto);
+  border: 2px solid;
+  padding: 1px;
+  margin: 1px;
+}
+.c {
+  grid: repeat(4, auto) / auto;
+}
+
+span {
+  background: lime;
+  border: 1px solid black;
+}
+
+span:nth-child(1) { font-size:15px; }
+span:nth-child(2) { font-size:30px; }
+span:nth-child(3) { font-size:10px; }
+.pbs { padding-block-start: 15px; margin-block-start: 5px; }
+.pbe { padding-block-end: 7px; margin-block-end: 3px; }
+
+.fb { align-content:baseline; align-self:self-start; justify-self:self-start; }
+.lb { align-content:last baseline; align-self:self-end; justify-self:self-end; }
+
+.hl { writing-mode: horizontal-tb; direction:ltr; }
+.hr { writing-mode: horizontal-tb; direction:rtl; }
+.vl { writing-mode: vertical-lr; text-orientation: sideways; }
+.vr { writing-mode: vertical-rl; text-orientation: sideways; }
+.vlr { writing-mode: vertical-lr; direction:rtl; text-orientation: sideways; }
+.vrl { writing-mode: vertical-rl; direction:ltr; text-orientation: sideways; }
+
+</style>
+</head>
+<body>
+
+<div class="grid hl"><span class="fb">A<br>B</span><span class="fb">M<br>N</span><span class="fb">X<br>Z</span></div>
+<div class="grid hl"><span class="fb pbe">A<br>B</span><span class="fb">M<br>N</span><span class="fb">X<br>Z</span></div>
+<div class="grid vl"><span class="fb">A<br>B</span><span class="fb">M<br>N</span><span class="fb">X<br>Z</span></div>
+<div class="grid vl"><span class="fb pbs">A<br>B</span><span class="fb">M<br>N</span><span class="fb">X<br>Z</span></div>
+<div class="grid vr"><span class="fb">A<br>B</span><span class="fb">M<br>N</span><span class="fb">X<br>Z</span></div>
+<div class="grid vr"><span class="fb pbe">A<br>B</span><span class="fb">M<br>N</span><span class="fb">X<br>Z</span></div>
+
+<br clear="all">
+
+<div class="grid hl"><span class="fb" style="padding-top:27px">A<br>B</span><span class="lb">M<br>N</span></div>
+<div class="grid hl"><span class="fb pbe" style="padding-top:27px">A<br>B</span><span class="lb" style="margin-bottom:7px">M<br>N</span></div>
+<div class="grid vl"><span class="fb" style="padding-left:18px">A<br>B</span><span class="lb">M<br>N</span></div>
+<div class="grid vl"><span class="fb pbs">A<br>B</span><span class="lb" style="padding-left:2px">M<br>N</span></div>
+<div class="grid vr"><span class="fb" style="padding-right:27px">A<br>B</span><span class="lb">M<br>N</span></div>
+<div class="grid vr"><span class="fb pbe" style="padding-right:27px">A<br>B</span><span class="lb" style="margin-left:7px">M<br>N</span></div>
+
+<br clear="all">
+
+<div class="grid c hl"><span class="fb vl">A<br>B</span><span class="fb vl">M<br>N</span><span class="fb vl">X<br>Z</span></div>
+<div class="grid c hl"><span class="fb vl pbe">A<br>B</span><span class="fb vl">M<br>N</span><span class="fb vl">X<br>Z</span></div>
+<div class="grid c vl"><span class="fb hl">A<br>B</span><span class="fb hl">M<br>N</span><span class="fb hl">X<br>Z</span></div>
+<div class="grid c vl" style="inline-size:100px"><span class="fb hl pbs">A<br>B</span><span class="fb hl">M<br>N</span><span class="fb hl">X<br>Z</span></div>
+<div class="grid c vr"><span class="fb hl">A<br>B</span><span class="fb hl">M<br>N</span><span class="fb hl">X<br>Z</span></div>
+<div class="grid c vr"><span class="fb hl pbe">A<br>B</span><span class="fb hl">M<br>N</span><span class="fb hl">X<br>Z</span></div>
+
+<br clear="all">
+
+<div class="grid c hl"><span class="fb vl" style="padding-left:18px">A<br>B</span><span class="vl">M<br>N</span></div>
+<div class="grid c hl"><span class="fb vl pbe" style="padding-left:18px">A<br>B</span><span class="vl">M<br>N</span></div>
+<div class="grid c vl"><span class="fb hl" style="padding-top:27px">A<br>B</span><span class="hl">M<br>N</span></div>
+<div class="grid c vl"><span class="fb hl pbs" style="padding-top:22px">A<br>B</span><span class="hl">M<br>N</span></div>
+<div class="grid c vr"><span class="fb hl" style="padding-top:27px">A<br>B</span><span class="hl">M<br>N</span></div>
+<div class="grid c vr" style="inline-size:100px"><span class="hl pbe" style="justify-self:start; padding-top:27px">A<br>B</span><span class="fb hl">M<br>N</span></div>
+
+</body>
+</html>