The current applet template is not compiled.

The new version can looks like:
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import javafx.scene.text.Text;

import javafx.scene.Font;
import javafx.scene.FontStyle;

import javafx.application.Stage;
import javafx.application.Application;

Application{
    stage: Stage{
        content: Text {
            x: 10, y: 30
            content: "HelloWorld"
            font: Font { size: 24  style: FontStyle.PLAIN }
        }
    }
} 
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