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diff --git a/dom/base/test/meta_viewport/test_meta_viewport7.html b/dom/base/test/meta_viewport/test_meta_viewport7.html
new file mode 100644
index 0000000000..1f40c27109
--- /dev/null
+++ b/dom/base/test/meta_viewport/test_meta_viewport7.html
@@ -0,0 +1,71 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>meta viewport test</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <meta name="viewport" content="width=320">
+  <script src="viewport_helpers.js"></script>
+</head>
+<body>
+  <p>Dynamic viewport updates</p>
+  <script type="application/javascript">
+    "use strict";
+
+    add_task(async function test1() {
+      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));
+
+      updateViewport("width=device-width");
+      let info = getViewportInfo(800, 480);
+      is(info.defaultZoom, 1,    "initial zoom is 100%");
+      is(info.width,       800,  "width is the same as the displayWidth");
+      is(info.height,      480,  "height is the same as the displayHeight");
+      is(info.autoSize,    true, "width=device-width enables autoSize");
+      is(info.allowZoom,   true, "zooming is enabled by default");
+
+      info = getViewportInfo(900, 600);
+      is(info.width,       900,  "changing the displayWidth changes the width");
+      is(info.height,      600,  "changing the displayHeight changes the height");
+    });
+
+    add_task(async function test2() {
+      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));
+
+      updateViewport("width=320");
+      let info = getViewportInfo(800, 80);
+      is(info.defaultZoom, 2.5,   "initial zoom fits the displayWidth");
+      is(info.width,       320,   "width is set explicitly");
+      is(info.height,      40,   "height is at the absolute minimum");
+      is(info.autoSize,    false, "width=device-width enables autoSize");
+      is(info.allowZoom,   true,  "zooming is enabled by default");
+
+      info = getViewportInfo(480, 800);
+      is(info.defaultZoom, 1.5,   "initial zoom fits the new displayWidth");
+      is(info.width,       320,   "explicit width is unchanged");
+      is(info.height,      533,   "height changes proportional to displayHeight");
+    });
+
+    add_task(async function test3() {
+      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));
+
+      updateViewport("user-scalable=no");
+      let info = getViewportInfo(800, 480);
+      is(info.allowZoom,   false, "zooming is explicitly disabled");
+    });
+
+    add_task(async function test4() {
+      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));
+
+      updateViewport("user-scalable=yes");
+      let info = getViewportInfo(800, 480);
+      is(info.allowZoom,   true,  "zooming is explicitly allowed");
+    });
+
+    function updateViewport(content) {
+      let meta = document.querySelector("meta[name=viewport]");
+      meta.content = content;
+    }
+  </script>
+</body>
+</html>