Another workaround could be using dynamically-created transparent background image with text on it. Or maybe using StackPane somehow.

Something like this?

StackPane pane = new StackPane();
StyledTextArea area = // creation code;
pane.getChildren().add(area);

Text promptText = new Text(/* prompt string */);
// or perhaps setMargin would be better...
StackPane.setAlignment(promptText, Pos.TOP_LEFT);

area.lengthProperty().addListener((obs, ov, nv) -> {
    if (nv == 0) {
        pane.getChildren().add(promptText)
    } else {
        pane.getChildren().remove(promptText)
});

Add support for a prompt / placeholder text when area is empty #256

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