JSFiddle - React, Tailwind, and code Playground

HTML

<form action="../Speichern/index.php" method="POST">
<table cellpadding="0" cellspacing="" border="0" >
<tr>
<td><input type="button" value="test" onclick="test()">
</td>
</tr>
</table>
</form>

JavaScript

function test()
{
   alert("test");
}