ADDITIONAL SYSTEM INFORMATION :
5.8.0-41-generic #46~20.04.1-Ubuntu SMP Mon Jan 18 17:52:23 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux


A DESCRIPTION OF THE PROBLEM :
JavaFX using WebView with URL youtube.com, the video appears lower track and gets slow


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1.Run program with URL "https://www.youtube.com"

2.Select any video and play


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Expected normal video without the track
ACTUAL -
A track will appear in the bottom Video in the Youtube video and there will also be a slowness

---------- BEGIN SOURCE ----------
import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
 
 
public class WebViewApp extends Application {
 
 
    public Parent createContent() {
 
        WebView webView = new WebView();
 
        final WebEngine webEngine = webView.getEngine();
        final String DEFAULT_URL = "http://www.youtube.com";
        webEngine.load(DEFAULT_URL);
 
        final TextField locationField = new TextField(DEFAULT_URL);
        final ChangeListener<String> changeListener =
            (ObservableValue<? extends String> observable,
             String oldValue, String newValue) -> {
                locationField.setText(newValue);
            };
        webEngine.locationProperty().addListener(changeListener);
        EventHandler<ActionEvent> goAction = (ActionEvent event) -> {
            webEngine.load(locationField.getText().startsWith("http://")
                    ? locationField.getText()
                    : "http://" + locationField.getText());
        };
        locationField.setOnAction(goAction);
 
        Button goButton = new Button("Go");
        goButton.setMinSize(Button.USE_PREF_SIZE, Button.USE_PREF_SIZE);
        goButton.setDefaultButton(true);
        goButton.setOnAction(goAction);
 
        // Layout logic
        HBox hBox = new HBox(5);
        hBox.getChildren().setAll(locationField, goButton);
        HBox.setHgrow(locationField, Priority.ALWAYS);
 
        final VBox vBox = new VBox(5);
        vBox.getChildren().setAll(hBox, webView);
        vBox.setPrefSize(800, 400);
        VBox.setVgrow(webView, Priority.ALWAYS);
        return vBox;
    }
 
    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setScene(new Scene(createContent()));
        primaryStage.show();
    }
 
    /**
     * Java main for when running without JavaFX launcher
     */
    public static void main(String[] args) {
        launch(args);
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
I didn't find any temporary method

FREQUENCY : always