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diff --git a/dom/base/test/meta_viewport/test_meta_viewport_negative_width_and_negative_height.html b/dom/base/test/meta_viewport/test_meta_viewport_negative_width_and_negative_height.html
new file mode 100644
index 0000000000..e458cbc8dd
--- /dev/null
+++ b/dom/base/test/meta_viewport/test_meta_viewport_negative_width_and_negative_height.html
@@ -0,0 +1,27 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>negative width and height 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, height=-240">
+  <script src="viewport_helpers.js"></script>
+</head>
+<body>
+  <p>width=-400, height=-240</p>
+  <script type="application/javascript">
+    "use strict";
+
+    add_task(async function negative_width_and_negative_height() {
+      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));
+
+      let info = getViewportInfo(800, 480);
+      // negative width and height should be ignored, then display width and
+      // height are used for viewport.
+      is(info.width, 800, "width should be the display width");
+      is(info.height, 480, "height should be the display height");
+    });
+  </script>
+</body>
+</html>