JSFiddle - React, Tailwind, and code Playground

HTML

<p>Here is some text and an <a href="">empty link</a>. You can see how it's quite visible.

<p>By comparison, <a href="/">working links</a> appear as normal.

CSS

a[href = ""] {
    background: red;
    color: white;
    font-size: x-large;
}