Inline JavaScript handlers

HTML

<!-- Learn about this code on MDN: https://developer.mozilla.org/en-US/docs/Learn/JavaScript/First_steps/What_is_JavaScript -->

<button onclick="createParagraph()">Click me!</button>

JavaScript

function createParagraph() {
  var para = document.createElement('p');
  para.textContent = 'You clicked the button!';
  document.body.appendChild(para);
}