JSFiddle - React, Tailwind, and code Playground

HTML

<table width="100%">
<tr>
    <td style="width: 10%; vertical-align:top;">Field:</td>
    <td id="InputContainer">
        <div id="divInput1" style="display: inline;">
            <input id="txtComment1" name="txtComment" type="text" maxlength="35" />
            <input id="btnDelete1" value="X" type="button" name="btnDelete" onclick="RemoveItem(this)" />
        </div>
    </td>
</tr>
</table>

JavaScript

function RemoveItem(button) {
    var container = document.getElementById("InputContainer");
    var tmpField = button.parentNode;
    alert("Field: " + tmpField.id);
}