1 files changed, 26 insertions, 0 deletions
diff --git a/dom/base/test/meta_viewport/test_meta_viewport_valid_width_and_no_height.html b/dom/base/test/meta_viewport/test_meta_viewport_valid_width_and_no_height.html
new file mode 100644
index 0000000000..b24ce680a7
--- /dev/null
+++ b/dom/base/test/meta_viewport/test_meta_viewport_valid_width_and_no_height.html
@@ -0,0 +1,26 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>valid width 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=400">
+  <script src="viewport_helpers.js"></script>
+</head>
+<body>
+  <p>width=400</p>
+  <script type="application/javascript">
+    "use strict";
+
+    add_task(async function valid_width() {
+      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));
+
+      let info = getViewportInfo(800, 480);
+      is(info.width, 400, "width should be 400");
+      is(info.height, 240, "height should be 240 which is the result of the " +
+                           "display height * viewport width / display width");
+    });
+  </script>
+</body>
+</html>