Frontend & browser·State, data and re-rendering
you show grey blocks the shape of the content instead of a spinner while the data loads.
Skeleton screen
Also calledskeleton loader, content placeholder
A placeholder that mimics the layout of the content that is coming. It improves perceived speed and, more usefully, reserves the space so nothing shifts when the real content lands. It becomes a liability when the skeleton's shape does not match the result, which turns one layout shift into two.