office-ui-fabric-react/src/components/Spinner/docs/SpinnerDos.md

Reusable React components for building experiences for Office 365.

- Use a Spinner when a task is not immediate.
- Use one Spinner at a time.
- Descriptive verbs are appropriate under a Spinner to help the user understand what's happening. Ie: Saving, processing, updating.
- Use a Spinner when confirming a change has been made or a task is being processed.