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diff --git a/dom/base/test/meta_viewport/test_meta_viewport_device_width_with_initial_scale_0_5.html b/dom/base/test/meta_viewport/test_meta_viewport_device_width_with_initial_scale_0_5.html
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+++ b/dom/base/test/meta_viewport/test_meta_viewport_device_width_with_initial_scale_0_5.html
@@ -0,0 +1,26 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+ <meta charset="utf-8">
+ <title>device-width with initial-scale=0.5 in meta viewport</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+ <meta name="viewport" content="width=device-width, initial-scale=0.5">
+ <script src="viewport_helpers.js"></script>
+</head>
+<body>
+ <p>width=device-width, initial-scale=0.5</p>
+ <script type="application/javascript">
+ "use strict";
+
+ add_task(async function device_width_with_initial_scale_0_5() {
+ await SpecialPowers.pushPrefEnv(scaleRatio(1.0));
+
+ let info = getViewportInfo(800, 480);
+ is(info.width, 1600, "width should be the display width / initial-scale");
+ is(info.height, 960, "height should be the display height / initial-scale");
+ is(info.defaultZoom, 0.5, "initial-scale should be 0.5");
+ });
+ </script>
+</body>
+</html>