Looks like a problem with animating this gif file.

package hs.mediasystem;
 
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
 
public class WebviewTest extends Application {
  public static void main(String[] args) {
    launch(args);
  }
 
  @Override
  public void start(Stage stage) throws Exception {
 
    WebView view = new WebView();
 
    view.getEngine().load("http://w133.hg3088.com/images/member/NewtoOld_chs.gif");
 
    Scene scene = new Scene(view);
 
    stage.setScene(scene);
 
    stage.show();
  }
}

Will throw below exception:
java.lang.IllegalArgumentException: Image scanlineStride is too small
at com.sun.prism.Image.<init>(Unknown Source)
at com.sun.prism.Image.fromByteBgraPreData(Unknown Source)
at com.sun.prism.ImageFormatTool.convertImageFrame(Unknown Source)
at com.sun.webpane.sg.prism.WCImageImpl.<init>(Unknown Source)
at com.sun.webpane.sg.prism.WCImgDecoderImpl.getPrismImage(Unknown Source)
at com.sun.webpane.sg.prism.WCImgDecoderImpl.getFrame(Unknown Source)
at com.sun.webpane.platform.WebPage.twkUpdateContent(Native Method)
at com.sun.webpane.platform.WebPage.updateDirty(Unknown Source)
at com.sun.webpane.platform.WebPage.updateContent(Unknown Source)
at com.sun.javafx.sg.prism.NGWebView.update(Unknown Source)
at javafx.scene.web.WebView.handleStagePulse(Unknown Source)
at javafx.scene.web.WebView.access$100(Unknown Source)
at javafx.scene.web.WebView$2.pulse(Unknown Source)
at com.sun.javafx.tk.Toolkit.firePulse(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit$8.run(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(Unknown Source)
at com.sun.glass.ui.win.WinApplication$2$1.run(Unknown Source)
at java.lang.Thread.run(Thread.java:722)