JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" id="a"  value="SUBMIT"  onclick="fnSubmitForm(this);">

<input type="button" id="b"  value="SUBMIT"  onclick="fnSubmitForm(this);">

<input type="button" id="c"  value="SUBMIT"  onclick="fnSubmitForm(this);">

JavaScript

function fnSubmitForm(el) {
  console.log(el.id);
}