import org.teavm.jso.dom.html.HTMLButtonElement;
import org.teavm.jso.dom.html.HTMLDocument;
import org.teavm.jso.dom.html.HTMLInputElement;

public class Main {
    public static void main(String[] args) {
        var document = HTMLDocument.current();

        var inputs = document.createElement("div");
        document.getBody().appendChild(inputs);
        inputs.appendChild(document.createTextNode("Your name: "));

        var input = (HTMLInputElement) document.createElement("input");
        input.setType("text");
        inputs.appendChild(input);

        var button = (HTMLButtonElement) document.createElement("button");
        button.appendChild(document.createTextNode("Greet"));
        inputs.appendChild(button);

        button.onClick(event -> {
            var output = document.createElement("div");
            output.appendChild(document.createTextNode("Hello, " + input.getValue() + "!"));
            document.getBody().appendChild(output);
        });
    }
}