Secrets by Specification
CSS Animations
47 Animation along a circular path
CSS Backgrounds & Borders
3 Flexible background positioning
30 Extending the clickable area
35 Interactive image comparison
CSS Backgrounds & Borders Level 4
dev.w3.org/csswg/css-backgrounds-4
CSS Basic User Interface
35 Interactive image comparison
CSS Box Alignment
CSS Flexible Box Layout
CSS Fonts
CSS Image Values
35 Interactive image comparison
CSS Image Values Level 4
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