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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-canvas-element/toBlob.png.html 

<!DOCTYPE html>
<title>Canvas test: toBlob.png</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<canvas id="c"></canvas>
<script>
async_test(function() {
    on_event(window, "load", this.step_func(function() {
        var canvas = document.getElementById('c');
        var ctx = canvas.getContext('2d');
        canvas.toBlob(this.step_func_done(function(data) {
            assert_equals(data.type, "image/png");
        }), 'image/png');
    }));
}, "toBlob with image/png returns a PNG Blob");
</script>