A very strange look at the https://wikimediafoundation.org/ on a mobile device:

• There is no indication that the page can scroll.
• If you are distracted for a few seconds, then you get the site in a completely unfamiliar language.
• It is possible to delay the loading of the background, on bad connections, for this reason just a yellow rectangle appears.

I think the yellow block should not be displayed on mobile devices.