Going deep with CSS

Going deep with CSS picks up where Going further with CSS left off. It assumes you have finished An introduction to CSS and Going further with CSS – selectors, the cascade, Flexbox and Grid, custom properties, cascade layers, container queries, and sensible architecture are all familiar territory.

The intermediate tutorials taught you how to build real layouts and keep CSS maintainable. These tutorials are about the harder problems: component systems that survive multiple authors, motion that does not jank, colour that holds up across displays, delivery that keeps first paint fast, and tooling choices that match the size of the project.

We go deeper on cascade layers in multi-source setups, container queries beyond the basics, view transitions, animation performance, anchor positioning, relative colour, typography systems, design token pipelines, critical CSS, utility CSS at scale, and light visual regression testing. These tutorials end with a mini project: a themeable component library with a CSS-only API.

Browser support moves quickly for some of these features. Where a tutorial covers something still rolling out, we say so and show a fallback mindset – progressive enhancement, not ‘wait five years’.

Plain CSS files are enough. No framework required. Use whatever editor you like; the examples work the same in VS Code, Nova, or anything else that handles text files.

Work through the tutorials in order when you can. Each one builds on the last. If cascade layers, container queries, or custom properties feel rusty, revisit the intermediate lessons first.