diff -r 000000000000 -r 6474c204b198 content/media/test/seek11.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/media/test/seek11.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+function test_seek11(v, seekTime, is, ok, finish) {
+
+// Test for bug 476973, multiple seeks to the same position shouldn't cause problems.
+
+var seekedNonZero = false;
+var completed = false;
+var target = 0;
+
+function startTest() {
+  if (completed)
+    return;
+  target = v.duration / 2;
+  v.currentTime = target;
+  v.currentTime = target;
+  v._seekTarget = target;
+}
+
+function startSeeking() {
+  ok(v.currentTime >= v._seekTarget - 0.1,
+     "Video currentTime should be around " + v._seekTarget + ": " + v.currentTime);
+  if (!seekedNonZero) {
+    v.currentTime = target;
+    v._seekTarget = target;
+    seekedNonZero = true;
+  }
+}
+
+function seekEnded() {
+  if (completed)
+    return;
+
+  if (v.currentTime > 0) {
+    ok(v.currentTime > target - 0.1 && v.currentTime < target + 0.1,
+       "Seek to wrong destination " + v.currentTime);
+    v.currentTime = 0.0;
+    v._seekTarget = 0.0;
+  } else {
+    ok(seekedNonZero, "Successfully seeked to nonzero");
+    ok(true, "Seek back to zero was successful");
+    completed = true;
+    finish();
+  }
+}
+
+v.addEventListener("loadedmetadata", startTest, false);
+v.addEventListener("seeking", startSeeking, false);
+v.addEventListener("seeked", seekEnded, false);
+
+}