ABC of CSS3 animations
summary
Shows purely CSS3 animations with no JavaScript for motion (only a class toggle), builds examples that use keyframes at 0/25/50/75/100% and multi-property changes (left/top/background-color/rotate), runs concrete timings like animation-duration: 5s with a 2s delay and iteration counts including 3 and alternate-reverse, compares timing functions (linear, ease, elastic), demonstrates a working falling‑leaf demo, and warns that multiple animations distract readers from page content.
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