JSFiddle - React, Tailwind, and code Playground

HTML

<a href='#'>blabla</a>
<br>
<a href='#' data-id='2'>blabla</a>

CSS

a {
    color: black
}

JavaScript

$(function() {
    $("a:first").attr("data-id", 2);
    $("a[data-id=2]").css("color", "red");
    $("a[data-id=2]").each(function (i, el) {
        alert($(el).data('id'));
    });
});