A skeleton is a type of loading state that allos you to expose content incrementally. For content that may take a long time to load, use a progress bar in place of a skeleton.
Skeleton loading should be progressive - it should load static text first, followed by variable elements of the UI.
When to use a skeleton vs. a loading spinner
Show a skeleton when:
- You know what the populated data is going to look like (even if it results in an empty state).
Show a spinner when:
- You do not know what the populated data may look like. For example, if you are loading a form (as they are not all structured the same).
- When it is likely it will fail or show an empty state while waiting for actions to complete.
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