<form method="post">
  <textarea id="tinymce-default">Hello, <b>Tabler</b>!</textarea>
</form>
<script>
  document.addEventListener("DOMContentLoaded", function () {
    let options = {
      selector: '#tinymce-default',
      height: 300,
      menubar: false,
      statusbar: false,
      plugins: [
        'advlist autolink lists link image charmap print preview anchor',
        'searchreplace visualblocks code fullscreen',
        'insertdatetime media table paste code help wordcount'
      ],
      toolbar: 'undo redo | formatselect | ' +
        'bold italic backcolor | alignleft aligncenter ' +
        'alignright alignjustify | bullist numlist outdent indent | ' +
        'removeformat',
      content_style: 'body { font-family: -apple-system, BlinkMacSystemFont, San Francisco, Segoe UI, Roboto, Helvetica Neue, sans-serif; font-size: 14px; -webkit-font-smoothing: antialiased; }'
    }
    if (localStorage.getItem("tablerTheme") === 'dark') {
      options.skin = 'oxide-dark';
      options.content_css = 'dark';
    }
    tinyMCE.init(options);
  })
</script>