Conic gradients and not conic gradients, masonry, Firefox 83, logical shorthands.
A container query-like solution with CSS math functions, detecting sticky items, :focus-within
Masonry, content-visibility, and hiding things with CSS
A grid solution to layout shifts, CSS Shapes and emoji, grid sites that don't look so griddy.
W3C TPAC, conic gradients in Firefox, focus, and CSS functions.
Interesting techniques with grid, subgrid, flexbox, and custom properties.
Flexbox gaps, DevTools, accessibility resources, and media queries
MDN Browser Compat Report, accessibility, animation, font-size with clamp()
In-depth with the display specification, sortable tables, and accessible navigation
CSS Clipping and Masking, a free 24 hour Inclusive Design event, Interaction Media Features