Warn about HTML Markup code accessibility issue.
First, Download the a11y.js
Second, include it before </body>
<script src="a11y.js"></script>Third, open the console.
if you need to test your website or any website without download the file you can put this code in the console.
var script = document.createElement("script");
script.type = "text/javascript";
script.src = "https://cdn.rawgit.com/Muhnad/a11y-checker/master/a11y.js";
document.body.appendChild(script);Thanks to @Paul Adam for upload the script in rawgit.
MIT