Intrigued by Keanu Lee's amazing article describing how he built the official <paper-spinner> Polymer element seen in the Google Material Design spec, I had to see if it was possible to simplify the spinner further by condensing it down to a single HTML element. My goal was to rebuild the paper-spinner in a way that was:
- Accessible ✓
- Cross browser compatible (IE10+) ✓*
- A single HTML element ✓
- HTML and CSS only ✓
- Uses relative units for easy scalability ✓
- Animated with strictly composite properties (
transformandopacity) ✓**
Well…I got really close. Check it out. (Pull requests are more than welcome.)
*I use clip-path: circle(), which is not available in IE or Firefox, as a progressive enhancement only to remove small artifacts left over from the animations.
**All spinners animate with composite properties except the multicolor spinner. The multicolor spinner unfortunately invokes repaints on color changes. :/ On the plus side, I haven't seen the frame rate dip below 60fps.
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Copyright (c) 2015-2020 Chris Nager
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