tinymce-docs/_includes/configuration/noneditable_editable_class.md

noneditable_editable_class

This option allows you to specify the class name that {{site.productname}} will use to determine which areas of content are editable when using the noneditable plugin. This would be the the same as contenteditable=true, forcing an element to be editable.

Note that classes with the mceItem prefix are invisible within {{site.productname}}.

Type: String

Default Value: 'mceEditable'

Example: Using noneditable_editable_class

tinymce.init({
  selector: 'textarea',  // change this value according to your HTML
  plugins: 'noneditable',
  noneditable_editable_class: 'mceEditable'
});