CKEditor 4 reached its End of Life (EOL) in June 2023. From then on, it will receive no more updates, new features, bug fixes, and security patches. Visit CKEditor 5 Docs for the actively supported CKEditor or check Extended Support Model.
Reset and External CSS
As we know, CKEditor is used inside webpages. In fact, the CKEditor 4 UI and the skin CSS files are all loaded inside a page that is out of the editor and skin control. This means that the skin can have interference from external CSS present on the page.
Let’s suppose a site likes red links. By simply adding a { color: red; } in a CSS file would be enough to make the toolbar labels or dialog tabs of the editor red.
To workaround this problem, a skin developer must include “reset styles” that will define defaults for most of the styles that could impact on the editor interface. Check the reset.css file in the Moono-Lisa skin. It is a useful base for it.