Noun
FOUC
(web development) Initialism of flash of unstyled content: a brief glimpse of page content without the proper formatting, before the correct styles have loaded.
Hyponym: FOUT
On slow connections FOUC still can happen - but: it's not a bug, it's a feature - i rather see some unstyled text (that i already can start reading) on my mobile phone, instead of waiting 5 minutes till the css finished downloading on edge connection. Source: Internet