simple EditBox and similar stuff in WebCore?

Windows has some simple functions like MessageBox and EditBox for displaying a simple message and asking for a bit of data. Are there any similar things in WebCore? If not, it seems like they'd be handy timesavers to have included.

MessageDlg() and ShowMessage() equivalent exists.
To get a value input, there is at this moment the standard browser function input().
But it is a good suggestion to have such message with input capability with look & feel of a MessageDlg(). We'll consider this.