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diff --git a/layout/reftests/writing-mode/1193519-sideways-lr-1-ref.html b/layout/reftests/writing-mode/1193519-sideways-lr-1-ref.html
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+++ b/layout/reftests/writing-mode/1193519-sideways-lr-1-ref.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset=utf-8>
+<style>
+div { padding: 5px; display: inline-block; }
+span { display: block; width: 2em; }
+span:nth-child(1) { background: red;    height: 1em; }
+span:nth-child(2) { background: orange; height: 1.1em; }
+span:nth-child(3) { background: yellow; height: 1.3em; }
+span:nth-child(4) { background: green;  height: 1.5em; }
+span:nth-child(5) { background: blue;   height: 1.7em; }
+span:nth-child(6) { background: indigo; height: 1.9em; }
+span:nth-child(7) { background: violet; height: 2em; }
+</style>
+</head>
+
+<body>
+
+<p>All four columns should look the same:
+<div><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></div>
+<div><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></div>
+<div><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></div>
+<div><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></div>