Page History

...

To limit WProofreader work only to CKEditor 4, you can use the enableAutoSearchIn option where you need to indicate the class of CKEditor 4. They hide the original element and create an iframe element with cke_wysiwyg_frame class: <iframe class="cke_wysiwyg_frame"></iframe>.  

enableAutoSearchIn: ['.cke_wysiwyg_frame'],

...