JSFiddle - React, Tailwind, and code Playground

by fainz777

HTML

<p>1. Цена есть: <span class="price">90</span></p>
<p>2. Цены нет: <span class="price"></span></p>

CSS

.price:not(:empty):before {
    content: '~';
}

.price:not(:empty):after {
    content: '$';
}