chromium/third_party/blink/web_tests/media/video-load-preload-none.html

<!DOCTYPE html>
<title>Test that an explicit load() to a media element whose preload is set to "none" still loads the video.</title>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<video preload="none"></video>
<script>
async_test(function(t) {
    var video = document.querySelector("video");

    assert_equals(video.preload, "none");
    assert_equals(video.readyState, HTMLMediaElement.HAVE_NOTHING);
    video.onloadedmetadata = t.unreached_func();

    // Wait 500ms before load()ing to make sure setting src does not
    // kick off the load (i.e. preload=none should still be respected).
    setTimeout(function() {
        assert_equals(video.readyState, HTMLMediaElement.HAVE_NOTHING);
        video.onloadedmetadata = t.step_func_done();
        video.load();
    }, 300);

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