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diff --git a/layout/reftests/font-features/1376231-vertical-gpos-adjustments-ref.html b/layout/reftests/font-features/1376231-vertical-gpos-adjustments-ref.html
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index 0000000000..7e5108e480
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+++ b/layout/reftests/font-features/1376231-vertical-gpos-adjustments-ref.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset=utf-8>
+<style>
+@font-face {
+ font-family: test;
+ src: url(../fonts/NotoSansCJKjp-Regular.subset.otf);
+}
+body {
+ font-family: test, serif;
+ line-height: 2em;
+}
+p {
+ margin: 1em;
+}
+span {
+ display: inline-block;
+ inline-size: 9em; /* length of 9 standard CJK chars */
+}
+.v {
+ writing-mode: vertical-rl;
+}
+.green {
+ color: green;
+ background: green;
+}
+.overlay {
+ position: relative;
+ inset-block-start: -3em;
+}
+</style>
+</head>
+<body>
+There should be no red:
+<div>
+ <p><span>&nbsp;</p>
+ <p class="overlay"><span class="green">&nbsp;</p>
+ <p><span>&nbsp;</p>
+ <p class="overlay"><span class="green">&nbsp;</p>
+</div>
+<div class="v">
+ <p><span>&nbsp;</p>
+ <p class="overlay"><span class="green">&nbsp;</p>
+ <p><span>&nbsp;</p>
+ <p class="overlay"><span class="green">&nbsp;</p>
+</div>