1 files changed, 43 insertions, 0 deletions
diff --git a/dom/browser-element/mochitest/browserElement_NextPaint.js b/dom/browser-element/mochitest/browserElement_NextPaint.js
new file mode 100644
index 000000000..749a8efe3
--- /dev/null
+++ b/dom/browser-element/mochitest/browserElement_NextPaint.js
@@ -0,0 +1,43 @@
+/* Any copyright is dedicated to the public domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Bug 808231 - Add mozbrowsernextpaint event.
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+browserElementTestHelpers.setEnabledPref(true);
+
+function runTest() {
+  var iframe = document.createElement('iframe');
+  iframe.setAttribute('mozbrowser', 'true');
+  document.body.appendChild(iframe);
+
+  // Add a first listener that we'll remove shortly after.
+  iframe.addNextPaintListener(wrongListener);
+
+  var gotFirstNextPaintEvent = false;
+  iframe.addNextPaintListener(function () {
+    ok(!gotFirstNextPaintEvent, 'got the first nextpaint event');
+
+    // Make sure we're only called once.
+    gotFirstNextPaintEvent = true;
+
+    iframe.addNextPaintListener(function () {
+      info('got the second nextpaint event');
+      SimpleTest.finish();
+    });
+
+    // Force the iframe to repaint.
+    SimpleTest.executeSoon(() => iframe.src += '#next');
+  });
+
+  // Remove the first listener to make sure it's not called.
+  iframe.removeNextPaintListener(wrongListener);
+  iframe.src = 'file_browserElement_NextPaint.html';
+}
+
+function wrongListener() {
+  ok(false, 'first listener should have been removed');
+}
+
+addEventListener('testready', runTest);