third_party/blink/web_tests/plugins/instance-available-before-stylesheets-loaded.html

<link rel="stylesheet" href="data:text/css,">
<embed id="plugin" type="application/x-blink-deprecated-test-plugin" width=100 height=100></embed>
<p id="result">
</p>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();

    var plugIn = document.getElementById("plugin");

    document.getElementById("result").innerText = ("testPassTestObject" in plugIn)
        ? "PASS: Plugin instance available while waiting for style sheets to load"
        : "FAIL: Plugin not instantiated on property access while waiting for style sheets to load";

</script>