index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>RDev ACE Editor</title>
    <style type="text/css" media="screen">
        #editor { 
            position: absolute;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
        }
    </style>
</head>
<body style="width: 100vw; height: 100vh;">
    <div id="editor" style="position: absolute; height: 80vh; width: 80vw;">
        
    </div>
    <script src="src/ace.js" type="text/javascript" charset="utf-8"></script>
    <script>
        var editor = ace.edit("editor");
        editor.setTheme("ace/theme/monokai");
        editor.session.setMode("ace/mode/javascript");
    </script>
</body>
</html>