textarea-placeholder-set-attribute.html

<script>

function finishTest()
{
    document.getElementById('textarea').setAttribute('placeholder','Placeholder');
    if (window.testRunner)
        testRunner.notifyDone();
}

function test()
{
    if (window.testRunner)
        testRunner.waitUntilDone();
    setTimeout(finishTest, 0);
}

</script>
<body onload="test()">
<p>If you can see the word "Placeholder" in the text area, then all is well.</p>
<p><textarea id="textarea"></textarea></p>
</body>

chromium/third_party/blink/web_tests/fast/forms/textarea/textarea-placeholder-set-attribute.html