1 files changed, 47 insertions, 0 deletions
diff --git a/dom/base/test/meta_viewport/test_meta_viewport_change_name.html b/dom/base/test/meta_viewport/test_meta_viewport_change_name.html
new file mode 100644
index 0000000000..84b9c321df
--- /dev/null
+++ b/dom/base/test/meta_viewport/test_meta_viewport_change_name.html
@@ -0,0 +1,47 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>name attribute changes</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <meta id="viewport" name="initial-name" content="width=device-width, initial-scale=1">
+  <script src="viewport_helpers.js"></script>
+</head>
+<body>
+  <script type="application/javascript">
+    "use strict";
+
+    add_task(async function change_name_attribute() {
+      await SpecialPowers.pushPrefEnv(scaleRatio(1.0));
+
+      let info = getViewportInfo(800, 480);
+      // There is no valid <meta name="viewport"> so that viewport info values
+      // are the same as values in test_meta_viewport0.html.
+      is(info.defaultZoom, 0.25,  "initial scale is clamped to the default mimumim scale");
+      is(info.minZoom, 0.25,      "minimum scale defaults to the absolute minimum");
+      is(info.maxZoom,     10,    "maximum scale defaults to the absolute maximum");
+      is(info.width,       980,   "width is the default width");
+      is(info.height,      588,   "height is proportional to displayHeight");
+      is(info.autoSize,    false, "autoSize is disabled by default");
+      is(info.allowZoom,   true,  "zooming is enabled by default");
+
+      // Now it's a valid viewport.
+      // eslint-disable-next-line no-undef
+      viewport.setAttribute("name", "viewport");
+      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");
+
+      // Now it's invalid again, but we retain the state.
+      // eslint-disable-next-line no-undef
+      viewport.setAttribute("name", "other");
+      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");
+    });
+  </script>
+</body>
+</html>