<p id="p" class="p">I am zaid.</p>
p {
  display: none;
}
$(document).ready(function () {
  $('p').append(' Hello World');
  $('p').show();
});

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js