- (void)webView:(WebView *)webView didPushStateWithinPageForFrame:(WebFrame *)frame;
- (void)webView:(WebView *)webView didReplaceStateWithinPageForFrame:(WebFrame *)frame;
- (void)webView:(WebView *)webView didPopStateWithinPageForFrame:(WebFrame *)frame;
+- (void)webView:(WebView *)webView didRemoveFrameFromHierarchy:(WebFrame *)frame;
@end