General usage example

        <p>Hello world</p>

Example with 3 code elements which default to HTML, CSS and JavaScript respectively:

        <p>Hello world</p>
      
        :root { color: hotpink; }
      
        document.querySelector("p").style.backgroundColor = "orange";

Example with 2 code elements which default to HTML and CSS respectively:

        <p>Hello world</p>
      
        :root { color: hotpink; }