Another issue is that switching between the two tabs will remove code.So once you place any code in the “text” tab, keep it there and do not switch to the visual.Word Press has it’s own Maintenance Mode it goes into when it performs a core, themes or plugins updates.The picture above shows what you see when Word Press is performing these updates.
Moreover, the configuration encryption key will be deleted and you won't be able to access your backup configuration either.
Word Press just updated to 4.8 and one of the new changes is that the basic “text widget” now has the option to use a “visual” tab or “text” tab.
The difference in the “visual” tab and “text” tab is that html code does not work in the “visual” tab.
See the CSS Help section further down this page for more information. Custom Design allows you to add or replace CSS for Word themes; it does not give you access to change HTML markup or PHP code. Uploading custom themes is supported on Word Business only. May I remove credit links such as ‘Blog at Word Press.com’, theme, font, or toolbar links?
Or if you’re looking to get one of the many Word themes customized and you’re not interested in learning CSS yourself, we recommend hiring a designer to make the changes you need. You can turn any Word theme into a blank canvas by turning off the theme’s CSS in your custom CSS settings. All Word users are required to maintain the Admin Bar (the dark bar that appears at the top of Word sites when logged in).