FULL PRODUCT VERSION :
java version "1.8.0_102"
Java(TM) SE Runtime Environment (build 1.8.0_102-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.102-b14, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 10.0.15063]

EXTRA RELEVANT SYSTEM CONFIGURATION :
Samsung 4K monitor

A DESCRIPTION OF THE PROBLEM :
Run both test files below on Win 10 with 4 K monitor, "SwingWebView.java" and "WebViewSample .java" which load the Google News webpage.

The font size in "SwingWebView.java" is way too small.



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Save each file below, compile and run side by side on Windows 10 with high resolution monitor.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The web page is rendered with the same font size in "SwingWebView.java" and "WebViewSample .java".
ACTUAL -
The font size is tiny in "SwingWebView.java". The WebView is rendered in JFXPanel.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
/** FIRST FILE */
import java.awt.Dimension;

import javax.swing.JFrame;

import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.scene.Scene;
import javafx.scene.web.WebView;

public class SwingWebView {

public static void main(String[] args) {

String url = "https://news.google.ca/";

JFrame frame = new JFrame();
frame.setTitle("SwingWebView");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JFXPanel jfx = new JFXPanel();//implicitly starts JavaFX if not already running
        
        Platform.runLater(() -> {
         final WebView webview = new WebView();
                jfx.setScene(new Scene(webview));
                webview.getEngine().load( url );
        });

        frame.getContentPane().add(jfx);

frame.setPreferredSize(new Dimension(1000, 750));
frame.pack();
frame.setVisible(true);
}
}

/** SECOND FILE */
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
 
public class WebViewSample extends Application {

public static final String url = "https://news.google.ca/";

@Override public void start(Stage stage) {
WebView webview = new WebView();

        // create the scene
     Scene scene = new Scene(webview);
        stage.setScene(scene);
        stage.show();
        
        // load the web page
webview.getEngine().load( url );
    }
 
    public static void main(String[] args){
        launch(args);
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
webview.setFontScale(1.5);