Sizing text to fill its container was one of the last design tasks that still needed JavaScript. The new CSS text-fit property, shipping first in Edge 150, does it natively - no library, no resize listeners, no flash. What it does and how to adopt it safely.
The :has() pseudo-class is the parent selector CSS never had - and it is far more. Style an element by what it contains, replace class-toggling JavaScript with one line of CSS, with real WordPress theme examples for cards, forms, and layouts.
The !important arms race is a missing-feature problem, and cascade layers are the feature. How CSS @layer separates selection from priority, ends specificity wars, and lets clean selectors win - even against plugin and theme CSS you do not control.
Safari 26.5 ships the CSS :open pseudo-class - one selector that matches accordions, dialogs, dropdowns, and pickers in their open state. Style them in pure CSS, no JavaScript, as a safe progressive enhancement. With real examples.