<!DOCTYPE html>
<html>
  <head>
    <title>Stencila Project</title>
    <link rel="stylesheet" type="text/css" href="./stencila.css">
    <script type="text/javascript" src="./katex/katex.min.js"></script>
    <script type="text/javascript" src="./lib/plotly.min.js"></script>
    <script type="text/javascript" src="./lib/substance.js"></script>
    <script type="text/javascript" src="./lib/texture.js"></script>
    <script type="text/javascript" src="./lib/stencila-mini.js"></script>
    <script type="text/javascript" src="./lib/stencila-libcore.xml.js"></script>
    <script type="text/javascript" src="./lib/stencila-libcore.all.js"></script>
    <script type="text/javascript" src="./stencila.js"></script>
    <script type="text/javascript" src="./vfs.js"></script>
    <script type="text/javascript" src="./env.js"></script>
    <script type="text/javascript" src="./app.js"></script>
  </head>
  <body></body>
</html>

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Stencila Project</title>
    <link rel="stylesheet" type="text/css" href="./stencila.css">
    <script type="text/javascript" src="./katex/katex.min.js"></script>
    <script type="text/javascript" src="./lib/plotly.min.js"></script>
    <script type="text/javascript" src="./lib/substance.js"></script>
    <script type="text/javascript" src="./lib/texture.js"></script>
    <script type="text/javascript" src="./lib/stencila-mini.js"></script>
    <script type="text/javascript" src="./lib/stencila-libcore.xml.js"></script>
    <script type="text/javascript" src="./lib/stencila-libcore.all.js"></script>
    <script type="text/javascript" src="./stencila.js"></script>
    <script type="text/javascript" src="./vfs.js"></script>
    <script type="text/javascript" src="./env.js"></script>
    <script type="text/javascript" src="./app.js"></script>
  </head>
  <body></body>
</html>

Add charset="utf-8" instruction to example HTML.
Add charset="utf-8" instruction to example HTML.