Reference index / 마이크로인터랙션·로딩 피드백
Spinner
Uses repeated rotation to indicate work whose completion fraction is unknown.
When to use it
Tasks with an unknown completion time.
Caveats and distinctions
Shows no numerical completion estimate; rotation speed does not measure progress.
Implementation and classification
UI·UX 모션 / 마이크로인터랙션·로딩 피드백
Sources and verification status
https://github.com/material-components/material-web/blob/main/docs/components/progress.md
Source scope and verification status describe the existing catalog record. Publishing this page does not independently re-verify the latest library version, license, or production behavior.