here's the IDL file from webkit's TextArea, you can see that
placeholder is supposed to exist.

    interface HTMLTextAreaElement : HTMLElement {
        attribute [ConvertNullToNullString] DOMString defaultValue;
        readonly attribute HTMLFormElement form;
        readonly attribute ValidityState validity;
        attribute [Reflect] DOMString accessKey;
        attribute long cols;
        attribute [Reflect] boolean disabled;
        attribute [Reflect] boolean autofocus;
        attribute long maxLength setter raises(DOMException);
        attribute [ConvertNullToNullString] DOMString name;
        attribute [Reflect] DOMString placeholder;
        attribute [Reflect] boolean readOnly;
        attribute [Reflect] boolean required;
        attribute long rows;
        readonly attribute DOMString type;
        attribute [ConvertNullToNullString] DOMString value;
        readonly attribute unsigned long textLength;

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