JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<body>
    <form name="form1" method="post" action="createTable();return myFunction();">
         <h1><b>Crawler Configuration</b></h1>

        <p>Required fields are followed by <strong><abbr title="required">*</abbr></strong>

        </p>
        <center>
            <label for="domain"> <span>Domain: </span>

            </label>
            <input type="text" list="Domaindata" name="DomainName" id="Domain_name" required="" />
            <datalist id="Domaindata">
                <option value="Music" />
                <option value="Application" />
                <option value="News" />
                <option value="Weather" />
                <option value="Phone" />
                <option value="Conatcts" />
                <option value="Message" />
            </datalist> <strong><abbr title="required">*</abbr></strong>

            <input type="submit" value="Submit" />
        </center>
        <fieldset>
            <legend><b>Crawlers for Selected Domain</b>

            </legend>
            <div id="list_container"></div>
        </fieldset>
        <fieldset>
            <legend><b>Websites for Selected Domain</b>

            </legend>
            <div id="table_container"></div>
        </fieldset>
    </form>
</body>

</html>

CSS

<style> h1 {
    margin-top: 0;
}
form {
    margin: 0 auto;
    width : auto;
    padding: 1em;
    border : 3px solid #CC8;
    border-radius: 1em;
}
label {
    display:inline-block;
    width:auto;
    text-align:left;
    padding:1em;
}
input {
    display:inline-block;
    width:200px;
    text-align:left;
}
fieldset {
    width: auto;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    margin : 0;
    border: 1px solid #999;
}
body {
    background: #fafafa;
    color: #444;
    font: 100%/30px'Helvetica Neue', helvetica, arial, sans-serif;
    text-shadow: 0 1px 0 #fff;
}
strong {
    font-weight: bold;
}
em {
    font-style: italic;
}
table {
    background: #f5f5f5;
    border-collapse: separate;
    box-shadow: inset 0 1px 0 #fff;
    font-size: 12px;
    line-height: 20px;
    margin: 30px auto;
    text-align: left;
    width: 800px;
}
th {
    background: linear-gradient(#777, #444);
    border-left: 1px solid #555;
    border-right: 1px solid #777;
    border-top: 1px solid #555;
    border-bottom: 1px solid #333;
    box-shadow: inset 0 1px 0 #999;
    color: #fff;
    font-weight: bold;
    padding: 10px 15px;
    position: relative;
    text-shadow: 0 1px 0 #000;
    text-align: right;
}
td {
    padding: 0.25rem;
    text-align: left;
    border: 1px solid #ccc;
}
tbody tr:hover {
    background: #C0C0C0;
}
ul {
    margin : 15px;
    padding: 0;
    list-style: square;
}
button {
    margin-left: 200px;
}
</style>

JavaScript

function myFunction() {
    document.getElementById("list_container").innerHTML = "";
    var input_domain = document.forms["form1"]["DomainName"].value;
    if (input_domain == null || input_domain == "") {
        alert("Please enter a valid domain");
        return;
    }
    var container = document.getElementById("list_container");
    var ul = document.createElement("ul");
    var navLinks = ["crawler3", "crawler4", "crawler5"];
    for (var i = 0; i < navLinks.length; i++) {
        ul.innerHTML += "<li> " + navLinks[i] + "</li>";
    }
    document.getElementById("list_container").appendChild(ul);
    return false;
}

function createTable() {
    document.getElementById("table_container").innerHTML = "";
    var input_domain = document.forms["form1"]["DomainName"].value;
    if (input_domain == null || input_domain == "") return;

    var table = document.createElement("table"),
        tablehead = document.createElement("thead"),
        theadrow = document.createElement("tr"),
        th1 = document.createElement("th"),
        th2 = document.createElement("th"),
        th3 = document.createElement("th"),
        th4 = document.createElement("th");
    th1.appendChild(document.createTextNode("Website"));
    th2.appendChild(document.createTextNode("Enable/Disable Live Update for LM and CBD"));
    th3.appendChild(document.createTextNode("From Date"));
    th4.appendChild(document.createTextNode("To Date"));
    theadrow.appendChild(th1);
    theadrow.appendChild(th2);
    theadrow.appendChild(th3);
    theadrow.appendChild(th4);
    tablehead.appendChild(theadrow);
    table.appendChild(tablehead);

    var names = ["website1", "website2"];
    var container = document.getElementById("table_container");
    var tablebody = document.createElement("tbody");
    for (var i = 0, len = names.length; i < len; ++i) {
        var row = document.createElement("tr"),
            column1 = document.createElement("td"),
            column2 =...