JSFiddle - React, Tailwind, and code Playground

HTML

<input oninput="test(event)">

JavaScript

function test(event) 
{	  
  let keys = Object.keys(event);
  let keysOwnProp = Object.getOwnPropertyNames(event);
  let keysForIn=[]; for(let k in event) { keysForIn.push(k); }
    
  console.log('---------')  
  console.log('Event:',event);
  console.log('keys (Object.keys):', keys);
  console.log('keys (Object.getOwnPropertyNames):', keysOwnProp);
  console.log('keys (for-in):', keysForIn);
}

window.test=test; // bind to work inside jsfiddle