Plain HTML

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>OpenMarkdown editor: plain HTML</title>
    <!-- Framework-free is not build-free: this page needs the package on npm, for esm.sh to serve.
         Unpublished package, or no CDN allowed? Build it once and serve the files yourself:
         https://openmarkdown.dev/editor/docs/guides/self-hosting/ -->
    <style>
      #editor { height: 360px; border: 1px solid #d9d6cf; border-radius: 8px; overflow: hidden; }
      #editor .cm-editor { height: 100%; }
    </style>
  </head>
  <body>
    <div id="editor"></div>
    <script type="module">
      import { createEditorState, mountEditor } from "https://esm.sh/@openmarkdown-dev/editor@0.1.0";

      mountEditor(
        document.getElementById("editor"),
        createEditorState({
          doc: "# Hello\n\nThis editor came from a CDN. No framework, no bundler.\n\n- [ ] Try a checkbox\n- **Bold** and `code` render as you type\n",
        }),
      );
    </script>
  </body>
</html>

{
  "name": "openmarkdown-editor-example-html-script",
  "private": true,
  "type": "module",
  "scripts": {
    "dev": "npx --yes serve ."
  }
}