Returns the first responder of the web view’s window.
Original signature is '- (NSResponder *)webViewFirstResponder:(WebView *)sender'
Available in Mac OS X v10.2 with Safari 1.0 and later.

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NSResponder WebViewFirstResponder( WebView sender )
Function WebViewFirstResponder ( _ sender As WebView _ ) As NSResponder
NSResponder^ WebViewFirstResponder( WebView^ sender )

- sender (WebView)
- The web view that sent the message.

The view or subview that currently has the input focus. It can return nil or the default first responder if the sender is not attached to a window or if another view (not in the window) has the focus.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)