The maintenance page does hide the skip to main content link. This is because system.module.css is no longer added in as I think I was in Drupal 7 afaik the equivalent system css files were added during system_init() when the db was available. They are now added in system_page_build() which is not fired for maintenance pages.
Current maintenance page
Image may be NSFW.
Clik here to view.
| Attachment | Size | Status | Test result | Operations |
|---|---|---|---|---|
| Maintenance_page-2.png | 39.57 KB | Ignored | None | None |
