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chromium/third_party/blink/web_tests/media/video-seekable.html 

<!DOCTYPE html>
<title>Test video "seekable" properties.</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");
    assert_equals(video.seekable.length, 0);
    assert_throws_dom("IndexSizeError", function() { video.seekable.start(-1); });
    assert_throws_dom("IndexSizeError", function() { video.seekable.end(-1); });
    assert_throws_dom("IndexSizeError", function() { video.seekable.start(0); });
    assert_throws_dom("IndexSizeError", function() { video.seekable.end(0); });

    video.onloadedmetadata = t.step_func_done(function () {
        assert_equals(video.seekable.length, 1);
        assert_equals(video.seekable.start(0), 0);
        assert_greater_than(video.seekable.end(0), 5);
        assert_less_than(video.seekable.end(0), 7);
        assert_throws_dom("IndexSizeError", function() { video.seekable.start(-1); });
        assert_throws_dom("IndexSizeError", function() { video.seekable.end(-1); });
        assert_throws_dom("IndexSizeError", function() { video.seekable.start(1); });
        assert_throws_dom("IndexSizeError", function() { video.seekable.end(1); });
    });

    video.src = "content/test.ogv";
});
</script>