1 files changed, 32 insertions, 0 deletions
diff --git a/dom/base/test/meta_viewport/test_meta_viewport_insert_before_existing_tag.html b/dom/base/test/meta_viewport/test_meta_viewport_insert_before_existing_tag.html
new file mode 100644
index 0000000000..e2162c81f8
--- /dev/null
+++ b/dom/base/test/meta_viewport/test_meta_viewport_insert_before_existing_tag.html
@@ -0,0 +1,32 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>interting a meta viewport tag before existing one</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <meta name="viewport" content="width=980">
+  <script src="viewport_helpers.js"></script>
+</head>
+<body>
+  <script type="application/javascript">
+    "use strict";
+
+    add_task(async function multiple_viewport_tags() {
+      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));
+
+      const meta = document.createElement("meta");
+      meta.setAttribute("name", "viewport");
+      meta.setAttribute("content", "initial-scale=1,maximum-scale=1");
+      document.head.insertBefore(meta, document.querySelector("meta[name=viewport]"));
+
+      let info = getViewportInfo(800, 480);
+      info = getViewportInfo(800, 480);
+      is(info.defaultZoom, 1, "initial zoom is 1");
+      is(info.width, 800, "width should be 800");
+      is(info.height, 480, "height should be 480");
+      is(info.maxZoom, 1, "maximum scale is 1");
+    });
+  </script>
+</body>
+</html>