LayoutTests/fast/forms/search-placeholder-value-changed.html

<input type="search" placeholder="Test FAILED!" id="test">
<script>
function delayedTest()
{
    var searchField = document.getElementById("test");
    searchField.setAttribute("placeholder", "Test Passed");
    if (window.testRunner)
        testRunner.notifyDone();
}

setTimeout(delayedTest, 100);

if (window.testRunner)
    testRunner.waitUntilDone();
</script>