The CSS.registerProperty() static method registers custom properties, allowing for property type checking, default values, and properties that do or do not inherit their value.| MDN Web Docs
1. Introduction| www.w3.org
Supporting both the user preference query for dark mode as well as a toggle previously required duplicated style blocks. With the incoming style queries feature, we can simply down to reading a custom property to define theme styles once.| thinkdobecreate.com
Some CSS properties inherit if you don't specify a value for them. Find out how this works, and how to use it to your advantage in this module.| web.dev
Review behaviors to be aware of regarding how the browser computes final custom property values. A misunderstanding of this process may lead to an unexpected or missing value and difficulty troubleshooting and resolving the issue.| Modern CSS Solutions
Also known as "CSS variables," this nifty modern CSS feature enables incredible flexibility throughout your stylesheets.| 12daysofweb.dev
How do you know using a new CSS features is "safe" to use? Review how to find information on new features, test for support, determine when to use a feature, and manage support with fallbacks and build tools.| Modern CSS Solutions