chromium/third_party/blink/web_tests/plugins/embed-attributes-active.html

<html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<body>
<embed style="visibility: hidden" type="image/svg+xml" id='embed'></embed>
<script>
var testobject = async_test("crbug.com/543905 : check that an embed does get loaded when setting properties type and src respectively");
var embed = document.getElementById('embed');
embed.addEventListener("load", testobject.step_func(() => {
    testobject.done();
}));
embed.type = "image/svg+xml"; // setting the type attribute should not effect the plugin once loaded
embed.src = "resources/410.svg"; // setting the source attribute should not effect the plugin once loaded
</script>
</body>
</html>