JSFiddle - React, Tailwind, and code Playground

HTML

<form onsubmit="foo();">

  <input type="submit" id="submit_button_1" value="Submit button 1">
  <input type="submit" id="submit_button_2" value="Submit button 2">

</form>

JavaScript

function foo()
{
  //Retrieve the submit button clicked by document.activeElement :

  console.log(document.activeElement);
}