JSFiddle - React, Tailwind, and code Playground
HTML
<article id="2332">content...</article>
<article id="0565">content...</article>
<article id="5686">content...</article>
JavaScript
var scrollindex = 0;
$('article').each(function() {
$(this).attr('scroll-index', scrollindex);
scrollindex++;
$(this).html($(this).attr('scroll-index'));
});