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diff --git a/testing/web-platform/tests/appmanifest/orientation-member/orientation-member-landscape-manual.html b/testing/web-platform/tests/appmanifest/orientation-member/orientation-member-landscape-manual.html
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+++ b/testing/web-platform/tests/appmanifest/orientation-member/orientation-member-landscape-manual.html
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+<!DOCTYPE html>
+<title>Test that orientation member with landscape value is supported</title>
+<link rel="help" href="https://w3c.github.io/manifest#orientation-member" />
+<link rel="manifest" href="resources/orientation-member-landscape.webmanifest" />
+<script src="resources/orientation-member-manual.js"></script>
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<h1>Testing support for orientation member with "landscape" value</h1>
+<style>
+  @media all and (orientation: landscape) {
+    body {
+      background-color: green;
+    }
+  }
+  @media all and (orientation: portrait) {
+    body {
+      background-color: red;
+    }
+  }
+</style>
+<p>
+  Please set the phone orientation to portrait.
+</p>
+<p>
+  To pass, after installing the display orientation must be landscape and the background must be green.
+</p>