Create History Feature

If this is not the place for feature request, please supply me with a link.

Please put a history feature for customize -> custom css similar to pages/posts. If my browser loads an older version or if I work on multiple pages and add css for those various pages, I might accidentally update an outdated version, losing hours of work that I have no idea what I did and what I need to fix again.

The wordpress 5.0 pages editor is frustrating when you press Ctrl + Z and it reverts all your changes to the last save, I can manually get to last save by not saving, but I now lost my Ctrl + Z default functionality that you expect from text editor.

Also on wordpress 5.0 pages editor please put a link to view the page right at the top, it is frustrating to click on Document tab -> permalink -> view page link. I sometimes need to reference the unedited version while doing an update, or want to update and view changes but the toast for view page disappears when you click on it but miss the link, or when you take too long.