Underline and line-through not straight in WebView

When a text is underlined or striked in a WebView (or HTMLEditor), the line is not straight and is slightly falling down.

Step to reproduce:
Run this code:
"import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;

public class LoadHtml extends Application {

    public void start(Stage primaryStage) throws Exception {
        primaryStage.setTitle(System.getProperty("java.runtime.version"));

        WebView browser = new WebView();
        WebEngine engine = browser.getEngine();

        engine.loadContent("<div style=\"font-size:36pt; font-family:Arial; text-decoration: underline; \">aaaaaaa aaaaaaaaaaaaaaaa</div>\n"
                + "<div style=\"font-size:36pt; font-family:Arial; text-decoration: line-through;\">aaaaaaa aaaaaaaaaaaaaaa</div>");

        StackPane sp = new StackPane();
        sp.getChildren().add(browser);

        Scene scene = new Scene(sp);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}"

Actual result:
See the capture where the line is slightly falling down.

Expected result:
The line should be straight.