This issue of What’s !important is dedicated to our friends in the UK, who are currently experiencing a very miserable 43-day rain streak. Presenting: the five most interesting things to read about CSS from the last couple of weeks. Plus, the latest features from Chrome 145, and anything else you might’ve missed. TL;DR: lots of content, but also lots of rain.

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A curated roundup of CSS developments covering developer productivity challenges, responsive breakpoint timing, lazy-loading techniques for above-the-fold iframes using the details element, corner-shape patterns in SVG backgrounds, and CSS usage patterns from The CSS Selection 2026 study. Chrome 145 brings text-justify, percentage units for word/letter spacing, overscroll-behavior for non-root containers, column-wrap/column-height properties, and customizable select elements. Future CSS features include multiple borders/outlines and border-shape.

What’s !important #5: Lazy-loading iframes, Repeating corner-shape Backgrounds, and More

Why you shouldn’t switch to smaller breakpoints too early

How to create repeating corner-shape backgrounds

Chrome features and Quick Hits you might’ve missed