Find a post with Stack Snippet (HTML/CSS/JavaScript) and go for "Expand snippet", for example this one.
I got this strange view on Chrome 70 (Windows 10):
Find a post with Stack Snippet (HTML/CSS/JavaScript) and go for "Expand snippet", for example this one.
I got this strange view on Chrome 70 (Windows 10):
I think I may have found the source of the problem:
In https://meta.stackexchange.com/content/Js/full-anon.en.js, the statement
e(".topbar, .container, .top-bar, #footer").hide()
should be
e(".topbar, .container, .top-bar, #footer, .js-dismissable-hero, .site-header").hide()
When a post has a snippet, some pieces of the site are not hidden when the snippet is expanded. The header for Meta StackExchange and banners (e.g. welcome or announcements) on StackOverflow and Meta SE (and possibly other sites) are not hidden. This causes the expanded snippet UI to be hard to understand in some cases. See pictures below.
This bug has been reproduced in the following browsers: (Windows 10)
The following pictures were from this post:
https://meta.stackexchange.com/a/279419.
(click thumbnails to view a larger image)