JSFiddle - React, Tailwind, and code Playground

HTML

<a href="http://ec2-54-253-250-162.ap-southeast-2.compute.amazonaws.com/media/cache/pdf_to_jpg/article-from-the-journal-of-the-american-medical-women-s-association-on-dr-lucy-gullett-38712.pdf" target="_new" id="url">Download the pdf documents </a>

JavaScript

var byteSize  = $("#url")[0].size;
$( "#url" ).after( byteSize);
alert (byteSize);