Reference TWebScriptDialogEvent
Declared in Codebot.WebKit.Controls.pas on line 106
Script dialog events are generated by javascript on a page. The actual dialog is shown by the default handler of TCustomWebBrowser, but you can override that functionality.
TWebScriptDialogEvent = procedure(Sender: TObject; Dialog: TWebScriptDialog; const Message: string; var Input: string; var Accepted: Boolean; var Handled: Boolean) of object;