run attached code snippet,

in next code hasFeature returns true, but getFeature throws UnsupportedOperationException

                    Document document = webEngine.getDocument();
                    boolean hasFeature = document.getImplementation().hasFeature("Views", "2.0");
                    System.out.println("hasFeature=" + hasFeature);
                    Object obj = document.getImplementation().getFeature("Views", "2.0");



java.lang.UnsupportedOperationException: Not supported yet.
at com.sun.webpane.webkit.dom.DOMImplementationImpl.getFeature(DOMImplementationImpl.java:132)
at web.WebViewViews$1.changed(WebViewViews.java:32)
at web.WebViewViews$1.changed(WebViewViews.java:25)
at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:196)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:100)
at javafx.beans.property.ReadOnlyDoubleWrapper$ReadOnlyPropertyImpl.fireValueChangedEvent(ReadOnlyDoubleWrapper.java:196)
at javafx.beans.property.ReadOnlyDoubleWrapper.fireValueChangedEvent(ReadOnlyDoubleWrapper.java:162)
at javafx.beans.property.DoublePropertyBase.markInvalid(DoublePropertyBase.java:130)
at javafx.beans.property.DoublePropertyBase.set(DoublePropertyBase.java:163)
at javafx.scene.web.WebEngine$LoadWorker.updateProgress(WebEngine.java:1015)
at javafx.scene.web.WebEngine$LoadWorker.dispatchLoadEvent(WebEngine.java:1085)
at javafx.scene.web.WebEngine$LoadWorker.access$600(WebEngine.java:968)
at javafx.scene.web.WebEngine$PageLoadListener.dispatchLoadEvent(WebEngine.java:955)
at com.sun.webpane.platform.WebPage.fireLoadEvent(WebPage.java:2372)
at com.sun.webpane.platform.WebPage.fwkFireLoadEvent(WebPage.java:2220)
at com.sun.webpane.webkit.network.URLLoader.twkDidFinishLoading(Native Method)
at com.sun.webpane.webkit.network.URLLoader.access$1300(URLLoader.java:42)
at com.sun.webpane.webkit.network.URLLoader$6.run(URLLoader.java:657)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
at com.sun.glass.ui.win.WinApplication$2$1.run(WinApplication.java:67)
at java.lang.Thread.run(Thread.java:722)