subscript 0.1.0

Work in progress...
Documentation 
<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8"/>
    <title>App</title>
    <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.2/css/all.css" integrity="sha384-oS3vJWv+0UjzBfQzYUhtDYW+Pj2yciDJxpsK1OYPAYjqT085Qq/1cq5FLXAZQ7Ay" crossorigin="anonymous">
    <link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:200,200i,300,300i,400,400i,600,600i,700,700i,900,900i&amp;subset=greek,greek-ext,latin-ext" rel="stylesheet">
    <style>
      html {
        box-sizing: border-box;
      }
      *, *:before, *:after {
        box-sizing: inherit;
      }
      html, body {
        margin: 0;
        padding: 0;
        height: 100%;
      }
    </style>
<!--     <script>
      let mount;
      let fragment;
      window.onload = function() {
        mount = document.createTextNode("Hello World");
        document.body.appendChild(mount);
        fragment = document.createDocumentFragment();
        let node1 = document.createElement("h1");
        let node2 = document.createElement("h2");
        let node3 = document.createElement("h3");
        fragment.appendChild(node1);
        fragment.appendChild(node2);
        fragment.appendChild(node3);
        mount.after(fragment);
      };
    </script> -->
  </head>
  <body>
  </body>
</html>