JSFiddle - React, Tailwind, and code Playground

HTML

<h1> 
     <div class="sponsor"> 
          <span>Hello</span>  
     </div> 
     World 
</h1>

<buffer/>

CSS

h1::after {
    color: blue;
    content: 'h1';
}

.sponsor::after {
    color: red;
    content: 'div';
}

.sponsor::outside {
    color: green;
}