LayoutTests/fast/forms/textarea-placeholder-pseudo-style.html

<style>
textarea.red::placeholder {
    color: rgb(100, 0, 0);
}
</style>
This tests that you can set the placeholder text color.<br>
<textarea class="red" placeholder="text"></textarea>
<textarea class="red" disabled placeholder="disabled text"></textarea>
<textarea placeholder="default"></textarea>
<textarea disabled placeholder="default disabled"></textarea>