Break down the parts of a URL and explore APIs for working with them in JavaScript, parsing them, building query strings, checking their validity, etc.

Explore DOM manipulation patterns in JavaScript, such as choosing the right querySelector, caching elements, improving event handling, and more.

CSS scrollTimeline introduces a new way to add scroll-linked animations to your webpage. Use and compare it to the Web Animations API here.

Learn about five web performance APIs, which have full browser support and offer many ways for you to measure your apps’ performance.

If you haven’t taken up TypeScript yet, now’s the time! Start here by learning how TypeScript can benefit your project, and what to be wary of.

There are many ESLint rules for React out there — learn which ones are most useful in this post, which covers the twelve most essential ones.

Client-side form validation such as HTML5 gives users near-immediate feedback about whether or not their input data is valid.