examples/codemirror.html

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
        <title>CodeMirror</title>

        <!-- include libs stylesheets -->
        <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
        <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"></script>

        <!-- include codemirror (codemirror.css, codemirror.js, xml.js, formatting.js)-->
        <link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/codemirror/5.41.0/codemirror.min.css" />
        <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/codemirror/5.41.0/theme/blackboard.min.css">
        <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/codemirror/5.41.0/theme/monokai.min.css">
        <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/codemirror/5.41.0/codemirror.js"></script>
        <script src="//cdnjs.cloudflare.com/ajax/libs/codemirror/5.41.0/mode/xml/xml.min.js"></script>

        <!-- include summernote -->
        <script type="text/javascript" src="/summernote-bs5.js"></script>

        <link rel="stylesheet" href="example.css">
        <script type="text/javascript">
            document.addEventListener('DOMContentLoaded', () => {
                Summernote.init(document.querySelector('.summernote'), {
                    height: 200,
                    tabsize: 2,
                    codemirror: {
                        mode: 'text/html',
                        htmlMode: true,
                        lineNumbers: true,
                        theme: 'monokai',
                    },
                });
            });
        </script>
    </head>
    <body>
        <div class="container">
            <h1>Summernote with CodeMirror</h1>
            <p><a href="https://summernote.org/examples/#codemirror-as-codeview">https://summernote.org/examples/#codemirror-as-codeview</a></p>
            <textarea class="summernote"><p>Seasons <b>coming up</b></p></textarea>
        </div>
    </body>
</html>