https://pub.dev/documentation/flutter_webview_plugin_ohos/latest/flutter_webview_plugin/FlutterWebviewPlugin/onBack.html
onBack property - FlutterWebviewPlugin class - flutter_webview_plugin library - Dart API
API docs for the onBack property from the FlutterWebviewPlugin class, for the Dart programming language.
flutter webviewplugin libraryonbackpropertyflutterwebviewplugin