JSFiddle - React, Tailwind, and code Playground

HTML

<div id="content">
    <div>
        <input type="text"/>
        <input type="text"/>
        <input type="text"/>
        <input type="text"/>
        <button class="add_line" href="#">Add</button>
    </div>
</div>

JavaScript

$("#content").delegate(".add_line", "click", function() {
    var content = '<div>' +
                         '<input type="text"/>' +
                         '<input type="text"/>' +
                         '<input type="text"/>' +
                         '<input type="text"/>'+
                         '<a class="del_line" href="#">Delete</a>&nbsp;' +
                         '<a class="add_line" href="#">Add</a>'+
                         '</div>';
    $("#content").append(content);
    return false;   
});

$("#content").delegate(".del_line", "click", function() {
    $(this).parent().remove();
    return false;  
});