A curated roundup of recent CSS and web platform news covering: testing Safari without Apple hardware, the new ::checkmark pseudo-element for styling checkmarks/radios/selects, combining border-shape with shape() for creative styling, deep dives into sibling-index() and sibling-count(), an alternative to the dropped HTML anchor attribute using data attributes and advanced attr(), the State of CSS 2026 survey, and Firefox 151 shipping container style queries (now Baseline) and the Document Picture-in-Picture API.
Table of contents
Testing in Safari when you don’t have SafariA first look at ::checkmarkDifferent shape styles with border-shape + shape()A concise guide to sibling-index() and sibling-count()Managing anchor associations with data attributes and advanced attr()Take the State of CSS 2026 surveyNew web platform featuresSort: