Design Patterns on CodePen
This ever-growing curated collection of interface patterns on CodePen is a reliable source of inspiration.
Link tags: indicators
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Single Element CSS Spinners
A lovely little selection of loading indicators powered by CSS animations and transitions.
AJAX Activity Indicators
Want to indicate that something is happening on a web page, like... oh, I don't know... an Ajax request or something? Here's a cornucopia of animated progress indicators.