Skeleton loader
Placeholder shapes that mimic the layout of loading content — showing structure before data arrives.
What you're seeing
Grey boxes in the shape of text, images, and cards appear while real content loads.
Where you'll see it
Any content that loads asynchronously.
Difficulty
Very low — 1/5
Libraries that build it
CSS onlycustom JS
From the toolbox
Ready to prompt — paste this into your AI coding tool
"Create skeleton placeholder matching [component] layout, animate with shimmer using CSS linear-gradient animation"