A comprehensive guide covering nine types of lengths that CSS uses to size elements in terms of dimensions, space, time, and even sound. The sort of thing worth bookmarking.

View transitions are not tied to a specific application architecture or framework and can be triggered not only on a single document and also between two different documents.

The CSS Working Group resolved to add an inline if() to CSS. Seen by many as an overwhelmingly positive step forward, but one that raises lots of questions too. Lea explains what this all means, and why it’s exciting.