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diff --git a/testing/web-platform/tests/media-source/mediasource-attach-stops-delaying-load-event.html b/testing/web-platform/tests/media-source/mediasource-attach-stops-delaying-load-event.html
new file mode 100644
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+++ b/testing/web-platform/tests/media-source/mediasource-attach-stops-delaying-load-event.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<!-- Copyright © 2016 Chromium authors and World Wide Web Consortium, (Massachusetts Institute of Technology, ERCIM, Keio University, Beihang). -->
+<title>Tests that MediaSource attachment stops delaying the load event.</title>
+<link rel="author" title="Matthew Wolenetz" href="mailto:wolenetz@chromium.org"/>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+async_test(function(test)
+{
+    var receivedLoadEvent = false;
+    var receivedSourceOpenEvent = false;
+
+    window.addEventListener("load", test.step_func(function() {
+        assert_false(receivedLoadEvent, "window should not receive multiple load events");
+        receivedLoadEvent = true;
+        assert_equals(document.readyState, "complete", "document should be complete");
+        if (receivedLoadEvent && receivedSourceOpenEvent) {
+            test.done();
+        }
+    }));
+
+    assert_equals(document.readyState, "loading", "document should not be complete yet");
+    var video = document.createElement("video");
+    var mediaSource = new MediaSource();
+
+    // |video| should stop delaying the load event long and complete the MediaSource attachment
+    // before either a "progress", "stalled" or "suspend" event are enqueued.
+    video.addEventListener("suspend", test.unreached_func("unexpected 'suspend' event"));
+    video.addEventListener("stalled", test.unreached_func("unexpected 'stalled' event"));
+    video.addEventListener("progress", test.unreached_func("unexpected 'progress' event"));
+
+    // No error is expected.
+    video.addEventListener("error", test.unreached_func("unexpected 'error' event"));
+
+    mediaSource.addEventListener("sourceopen", test.step_func(function() {
+        assert_false(receivedSourceOpenEvent, "only one sourceopen event should occur in this test");
+        receivedSourceOpenEvent = true;
+        assert_equals(video.networkState, video.NETWORK_LOADING);
+        assert_equals(video.readyState, video.HAVE_NOTHING);
+        if (receivedLoadEvent && receivedSourceOpenEvent) {
+            test.done();
+        }
+    }));
+
+    var mediaSourceURL = URL.createObjectURL(mediaSource);
+    video.src = mediaSourceURL;
+    test.add_cleanup(function() { URL.revokeObjectURL(mediaSourceURL); });
+}, "MediaSource attachment should immediately stop delaying the load event");
+</script>