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CSS Web Components are a JavaScript-free approach to building marketing site design systems using custom HTML elements styled entirely with CSS. Unlike traditional web components that require Shadow DOM and JavaScript for registration, this pattern wraps standard HTML in custom element tags and uses CSS attribute selectors to implement component variants and functionality. The approach enables progressive enhancement, minimal dependencies, full SSR support, and leverages modern CSS features like cascade layers, container queries, :has(), and CSS variables for theming and conditional styling.

CSS Web Components for marketing sites

I am all for simple, lightweight and easy to use web-components and i like some of the ideas you mention on your post.
But not everything needs to be a webcomponent. For instance on your example, why does the swim-lane need to be a webcomponent? Is there some behaviour you are adding to that element?

I think I see what the author is doing and I can see where <a href="https://app.daily.dev/luispato" data-mention-id="UcX5vJcegV5RDMeKh2XUt" data-mention-username="luispato" translate="no">@luispato</a> is coming from and also thanks to <a href="https://app.daily.dev/sachin04y" data-mention-id="4AIi9tCdWFw1mkIzwhJP8" data-mention-username="sachin04y" translate="no">@sachin04y</a> for sharing his example. It got me thinking about –
Am i able to accomplish the same thing if I set the a href with a default style in css then make a variant class for mouse behaviors and another variant for shapes and another variant for animations. I started thinking about how much more effiecient css can get. This helped me organize my --root with properties better.
<img src="https://media.daily.dev/image/upload/s--wWZ_RvTQ--/f_auto/v1769962845/ugc/content_f0c11d8b-9ed7-421d-9a6f-cf8f795f8d75?_a=BAMAMiiu0" alt="Screenshot 2026-02-01 102016">

Neat!
I had created the whole set of components, mostly the grid system using these custom attributes. But this custom element is way better as a wrapper.
For eg.
<img src="https://media.daily.dev/image/upload/s--CNBLdfEX--/f_auto/v1769773251/ugc/content_a0920a22-5f0c-45e4-8356-d5f4752f4476?_a=BAMAMiiu0" alt="image">