How to make an overlay on top of JavaFX 2 webview? -

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is possible to overlay javafx2 widgets or canvas on top of javafx 2 webview?

i want generate transparent heatmap means of javafx 2 on top of webview.

do mean this: 

import javafx.application.application; import javafx.scene.scene; import javafx.scene.layout.pane; import javafx.scene.layout.stackpane; import javafx.scene.paint.color; import javafx.scene.shape.rectangle; import javafx.scene.shape.rectanglebuilder; import javafx.scene.text.font; import javafx.scene.text.fontweight; import javafx.scene.text.text; import javafx.scene.text.textbuilder; import javafx.scene.web.webview; import javafx.stage.stage;  public class demo extends application {      @override     public void start(stage primarystage) {         webview webview = new webview();         webview.getengine().load("http://www.google.com");         stackpane root = new stackpane();         root.getchildren().addall(webview, getoverlay());         primarystage.setscene(new scene(root, 300, 250));         primarystage.show();     }       private pane getoverlay() {         stackpane p = new stackpane();         rectangle r = rectanglebuilder.create()                 .height(100).width(100)                 .archeight(40).arcwidth(40)                 .stroke(color.red)                 .fill(color.web("red", 0.1))                 .build();          text txt=textbuilder.create().text("overlay")                 .font(font.font("arial", fontweight.bold, 18))                 .fill(color.blue)                 .build();          p.getchildren().addall(r, txt);          return p;     }       public static void main(string[] args) {         launch(args);     } }

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