@Tag("my-custom-element") @JsModule("my-custom-element.js") public class MyCustomElement extends Component { public MyCustomElement() { getElement().appendChild(new Text("Hello World")); addKeyPressListener(Keys.ENTER, this::handleEnterKey); addKeyPressListener(Keys.ESCAPE, this::handleEscapeKey); } private void handleEnterKey(KeyboardEvent event) { } private void handleEscapeKey(KeyboardEvent event) { } }