1 files changed, 71 insertions, 0 deletions
diff --git a/dom/browser-element/mochitest/browserElement_Viewmode.js b/dom/browser-element/mochitest/browserElement_Viewmode.js
new file mode 100644
index 000000000..51627d9a8
--- /dev/null
+++ b/dom/browser-element/mochitest/browserElement_Viewmode.js
@@ -0,0 +1,71 @@
+/* Any copyright is dedicated to the public domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test that the onmozbrowsermetachange event for viewmode works.
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+browserElementTestHelpers.setEnabledPref(true);
+browserElementTestHelpers.addPermission();
+
+function runTest() {
+  function loadFrameScript(script) {
+    SpecialPowers.getBrowserFrameMessageManager(iframe1)
+                 .loadFrameScript('data:,' + script,
+                                  /* allowDelayedLoad = */ false);
+  }
+
+  let iframe1 = document.createElement('iframe');
+  iframe1.setAttribute('mozbrowser', 'true');
+  iframe1.src = "http://test/tests/dom/browser-element/mochitest/file_browserElement_Viewmode.html";
+  iframe1.addEventListener('mozbrowsermetachange', tests);
+  document.body.appendChild(iframe1);
+
+  let numMetaChanges = 0;
+  function tests(e) {
+    let detail = e.detail;
+
+    switch (numMetaChanges++) {
+      case 0: {
+        is(detail.name, 'viewmode', 'name matches');
+        is(detail.content, 'projection=stereo', 'content matches');
+        is(detail.type, 'added', 'type matches');
+
+        let script =
+          "var meta = content.document.head.querySelector('meta');" +
+          "meta.content = 'projection=mono';";
+        loadFrameScript(script);
+        break;
+      }
+
+      case 1: {
+        is(detail.name, 'viewmode', 'name matches');
+        is(detail.content, 'projection=mono', 'content matches');
+        is(detail.type, 'changed', 'type matches');
+
+        let script =
+          "var meta = content.document.head.querySelector('meta');" +
+          "meta.parentNode.removeChild(meta);";
+        loadFrameScript(script);
+        break;
+      }
+
+      case 2: {
+        is(detail.name, 'viewmode', 'name matches');
+        is(detail.content, 'projection=mono', 'content matches');
+        is(detail.type, 'removed', 'type matches');
+
+        SimpleTest.finish();
+        break;
+      }
+
+      default: {
+        ok(false, 'Too many metachange events.');
+        break;
+      }
+    }
+  };
+}
+
+window.addEventListener('testready', runTest);
+