goBack method
Goes back in the history of the WebView.
Official Android API: https://developer.android.com/reference/android/webkit/WebView#goBack()
Official iOS API: https://developer.apple.com/documentation/webkit/wkwebview/1414952-goback
Implementation
Future<void> goBack() async {
Map<String, dynamic> args = <String, dynamic>{};
await _channel.invokeMethod('goBack', args);
}