   <script>
            function set_active_el() {
            document.getElementById("active-el-input").focus();
            }
        </script>
        <button id="set-active-el" onclick="set_active_el()">Set active element</button>
        <input type="text" id="active-el-input">

        <h3>Element text section</h3>
        <textarea id="element-text">Element text goes here.</textarea>

        <h3>Element value section</h3>
        <input type="text" id="element-value" value="value text">

        <h