What's !important #5: Lazy-loading iframes, Repeating corner-shape Backgrounds, and More | CSS-Tricks

"Why you can only code for 4 hours/day Don't worry, you're only coding for 52 minutes/day anyway. Dr. Milan Milanović talks about the devastating impact of meetings, emails, Slack, and interruptions, and what you/your manager can do about it. This article is a real eye-opener with a ton of shocking (but not surprising) statistics about the average developer's flow state."

"How to lazy-load above-the-fold iframes loading=lazy only works for off-screen elements, so Stefan Bauer demonstrates a neat trick for lazy-loading above-the-fold <iframe>s using <details>. How to create repeating corner-shape backgrounds Preethi Sam shows us how to use corner-shape in <svg>s, which are then used as repeating backgrounds. I've done my own experiments with corner-shape, but this is wonderful and certainly something that I hadn't considered."

"The CSS Selection (2026 edition) What do web developers actually do with CSS? While other research studies look at features, The CSS Selection (2026 edition) focuses on CSS patterns and techniques. It's a very interesting read, and you'll definitely laugh once or twice, especially as you discover the different typos for !important. Here are some of my favorites: Chrome features and Quick Hits you might've missed Chrome 145 shipped a few days ago, and as always, we've been sharing some Quick Hits throughout the week."

Developers experience severe flow disruption from meetings, emails, Slack, and other interruptions, often leaving only four productive coding hours per day and an effective coding time near 52 minutes daily. Early breakpoint switches can mis-handle user scenarios; delaying switches preserves layout stability across varied devices. loading=lazy does not affect above-the-fold iframes, so using interactive patterns such as <details> enables deferred iframe loading without blocking initial view. SVG corner-shape can generate reusable, repeating corner backgrounds for creative designs. CSS pattern research examines common techniques and reveals frequent typos like variants of !important. Chrome 145 introduces new features and Quick Hits for developers.

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