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chromium/third_party/blink/web_tests/media/video-src-none.html 

<!DOCTYPE html>
<title>Test that calling load() with no "src" should not fire "error" event and network state should be NETWORK_EMPTY.</title>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<video></video>
<script>
async_test(function(t) {
    var video = document.querySelector("video");

    video.onerror = t.unreached_func();
    // Network state should remain in NETWORK_EMPTY with missing "src" attribute.
    verifyVideoState();
    video.load();

    setTimeout(t.step_func_done(function() {
        verifyVideoState();
    }), 100);

    function verifyVideoState() {
        assert_equals(video.error, null);
        assert_equals(video.networkState, HTMLMediaElement.NETWORK_EMPTY);
        assert_equals(video.src, "");
    }
});
</script>