JSFiddle - React, Tailwind, and code Playground

HTML

<p>...</p>
<h1>A Title</h1>
<p>...</p>

CSS

h1:before {
    content: "Chapter " counter(lvl1) "\000d\000a";
    counter-increment: lvl1;
    white-space: pre-wrap;
}
h1 {
    page-break-before: right;
}

JavaScript

$('h1').each(function(){
    alert(window.getComputedStyle(this,':before').content);
});