Browser tag shim

chrome/test/data/extensions/platform_apps/browser_tag/main.js

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+onload = function() {
+  chrome.test.runTests([
+    function browserTag() {
+      var browserTag = document.querySelector('browser');
+      // Since we can't currently inspect the page loaded inside the <browser>,
+      // the only way we can check that the shim is working is by changing the
+      // size and seeing if the shim updates the size of the DOM.
+      chrome.test.assertEq(300, browserTag.offsetWidth);
+      chrome.test.assertEq(200, browserTag.offsetHeight);
+
+      browserTag.setAttribute('width', 310);
+      browserTag.setAttribute('height', 210);
+
+      // Timeout is necessary to give the mutation observers a chance to fire.
+      setTimeout(function() {
+        chrome.test.assertEq(310, browserTag.offsetWidth);
+        chrome.test.assertEq(210, browserTag.offsetHeight);
+
+        // Should also be able to query/update the dimensions via getterts/
+        // setters.
+        chrome.test.assertEq(310, browserTag.width);
+        chrome.test.assertEq(210, browserTag.height);
+
+        browserTag.width = 320;
+        browserTag.height = 220;
+
+        // Setters also end up operating via mutation observers.
+        setTimeout(function() {
+          chrome.test.assertEq(320, browserTag.offsetWidth);
+          chrome.test.assertEq(220, browserTag.offsetHeight);
+
+          chrome.test.succeed();
+        }, 0);
+      }, 0);
+    }
+  ]);
+};