The admin/modules page has table headers whose text overlaps. The left-most column has the word "ENABLED" as its column header, but that is supposed to be invisible text. Instead it is overlapping the next column header, making both illegible. Screenshot attached from Chrome 28. Also verified in Safari 6.
The problem is caused by use of the CSS class "element-invisible" which is no longer part of D8. That class has been replaced with "visually-hidden". This is a follow-up fix towhich used the CSS class "element-invisible".
This will be an easy one-line fix.