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+++ b/layout/reftests/writing-mode/1147834-relative-overconstrained-horizontal-tb-ltr.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Overconstrained relative positioning</title>
+    <style>
+    .test {
+      border: 1px solid black;
+      height: 200px;
+      width:  400px;
+      writing-mode: horizontal-tb;
+      direction: ltr;
+    }
+    #inner1 {
+      position: relative;
+      left: 40px;
+      right: 40px;
+      top: 20px;
+      bottom: 20px;
+      height: 180px;
+      width: 360px;
+      background-color: teal;
+    }
+    </style>
+  </head>
+  <body>
+    <div class="test">
+      <div id="inner1"></div>
+    </div>
+  </body>
+</html>