What comes around goes around, right? A lot of these animated loaders done mainly with CSS harken back to the heyday of Flash — the initial experience taking a little longer than a person’s attention span. So to give the user a cue, a looping animation was created to indicate loading of the site/resources was in progress.
The list below shows 20 unique ways to show content is still in the process of being loaded.
Source: Line25 – Animated Loaders | 20 Unique Examples + Free Downloads