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chromium/third_party/blink/web_tests/media/video-src-invalid-poster.html 

<!DOCTYPE html>
<title>Test that media dimensions are equal to poster dimensions when "src" is invalid.</title>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<video poster="content/abe.png"></video>
<script>
async_test(function(t) {
    var video = document.querySelector("video");

    video.onloadstart = t.step_func(function () {
        var image = document.createElement("img");
        image.src = "content/abe.png";
        // With this we can be reasonably sure that the poster is loaded.
        image.onload = t.step_func_done(function() {
            assert_equals(video.clientWidth, 76);
            assert_equals(video.clientHeight, 103);
        });
    });

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