A skeleton screen is used as a placeholder while users wait for a page to load. This progress indicator is used for full page loads and reduces the perception of a long loading time by providing clues for how the page will ultimately look.| Nielsen Norman Group
Users are more satisfied and will wait longer when a site uses wait animations such as percent-done bars and spinners to explain >1 s response times delays.| Nielsen Norman Group
Reduce input effort for fields with values that vary little from the default by allowing users to increase or decrease the number in a single button press.| Nielsen Norman Group
2つの異なるシステム状態を切り替えるオンオフ型のコントロールは、現在の状態と、ユーザーがそのコントロールを押した場合にシステムが移行する状態の両方を、ユーザーに明確に伝える必要がある。| U-Site
