- Dec 13 Popover API
- Dec 14 Anchor Positioning
- Dec 15 CSS @scope
- Dec 16 Web Components
- Dec 17 CSS animation-composition
- Dec 18 New JS Array Methods
- Dec 19 View Transitions
- Dec 20 CSS Nesting
- Dec 21 Scroll-driven Animations
- Dec 22 FileReader API
- Dec 23 Responsive SVGs
- Dec 24 Container Style Queries