# What's !important #18: , Syntax ::highlight()ing, named-feature(), and More

DevFeed: [What's !important #18: , Syntax ::highlight()ing, named-feature(), and More](<https://devfeed.tech/articles/what-s-important-18-syntax-highlight-ing-named-feature-and-more-4267.md>)

Original publisher: [Read original article](<https://css-tricks.com/whats-important-18/>)

Author: Daniel Schwarz

Published: 2026-08-31T14:08:55Z

Content type: article

Language: en

Sources: [CSS-Tricks](<https://devfeed.tech/sources/css-tricks.md>)

Topics: [Web Development](<https://devfeed.tech/topics/web-development.md>), [Dark Mode](<https://devfeed.tech/topics/dark-mode.md>)

Tags: [api](<https://devfeed.tech/tags/api.md>), [articles](<https://devfeed.tech/tags/articles.md>), [chrome](<https://devfeed.tech/tags/chrome.md>), [css](<https://devfeed.tech/tags/css.md>), [custom-highlight-api](<https://devfeed.tech/tags/custom-highlight-api.md>), [dark-mode](<https://devfeed.tech/tags/dark-mode.md>), [developers](<https://devfeed.tech/tags/developers.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [news](<https://devfeed.tech/tags/news.md>)

## AI overview

A CSS-focused roundup covering delayed tooltips, progressive enhancement for geolocation, Custom Highlight API syntax highlighting, CSS grid data in custom properties, and dark-mode choices.

## Source excerpt

Well, that's a wrap. No, not a flex-wrap, but rather today marks a new day, week, month, season, aaaand new edition of What's important (#18), bringing you the best content that developers have produced over the last couple of weeks or so. What's !important #18: <geolocation>, Syntax ::highlight()ing, named-feature(), and More originally handwritten and published with love on CSS-Tricks. You should really get the newsletter as well.