A CSS-first Tailwind component library can give an app reusable, semantic component styles without adding its own JavaScript bundle. That is useful when you want application code—or a separate behavior layer—to own interactions. It is not a way to eliminate the JavaScript required by dialogs, dropdowns, command palettes, and other interactive controls.
The title’s “I stopped” and “built” describe the author’s perspective; the practical question for any team is whether it wants a library to supply styling, interaction behavior, or both.
What “CSS-first” means in a Tailwind component library
Tailwind CSS generates utility styles from classes it finds in scanned source files. A component library can build on that model by offering semantic classes—names that describe a component or its parts—rather than requiring every project to assemble each design from utilities. daisyUI is one example: its product description says it works across JavaScript frameworks and does not need a JavaScript bundle of its own.
That claim concerns daisyUI’s styling layer. It does not mean the application has no JavaScript, nor that a styled control automatically has the behavior users expect. A button can be styled entirely with CSS; opening a modal, managing focus, closing it with Escape, and returning focus to the trigger require behavior to be implemented somewhere.
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Why choose CSS-first over a library that supplies behavior?
The architectural trade-off is about ownership, not a blanket verdict that JavaScript-heavy libraries are bad. A library that includes interaction code can save implementation work. A CSS-first library can leave teams more freedom to choose how interactions are implemented and avoid taking on a library’s behavior layer when it is not wanted.
| Approach | What it contributes | What your team still needs to decide |
|---|---|---|
| CSS-first component styling, such as daisyUI | Reusable styles and semantic component classes; daisyUI says it does not need its own JavaScript bundle. | How interactive behavior, keyboard handling, focus management, and accessibility requirements will be provided. |
| Library with JavaScript behavior, such as Flowbite’s documented CDN setup | CSS plus a JavaScript file; Flowbite’s guide documents both in its installation instructions. | Whether its behavior fits the app’s framework and design, and what code the production app actually ships. |
| Tailwind Plus Elements | Custom elements for interactive UI blocks, including patterns that need JavaScript to be useful. | Whether its integration and product availability suit a new project; Tailwind Labs announced new Tailwind Plus sign-ups would close in September 2026. |
Flowbite’s cited installation example is version 4.0.1, so check its current setup guide before copying a CDN path. Likewise, the library choice should follow the interaction needs: if a project wants ready-made behavior, a behavior-supplying option may be a feature rather than overhead.
Where the interaction code belongs
For each interactive component, decide explicitly which layer owns the behavior. A CSS-first styling layer can coexist with behavior written in the application or supplied by another library; what matters is that the resulting component works for pointer, keyboard, and assistive-technology users.
- Dialogs: define how they open and close, how keyboard focus moves and stays within the dialog, and where focus returns afterward.
- Dropdowns and menus: decide how the trigger, open state, keyboard navigation, and dismissal work.
- Command palettes: specify opening shortcuts, focus behavior, selection, and dismissal.
These examples are not behavior that CSS-first styling supplies by itself. If the application owns it, the team must implement and test it; if a separate behavior layer owns it, account for that layer’s runtime and framework integration.
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Tailwind integration: make sure the library’s classes are detected
With Tailwind, build output depends on the classes found in scanned content. Tailwind’s documentation says dependencies are usually ignored by default, so a component library’s source may need to be exposed with @source. If classes appear in the library but Tailwind does not scan those files, expected styles may not be generated.
- Identify the library source location. Check its installation and integration guidance to find the files that contain the classes used by your app.
- Check Tailwind’s source detection. Confirm whether those files are in scanned content or whether the dependency is excluded by default.
- Add the documented
@sourceentry when needed. Use the path and syntax appropriate to the project’s setup, following Tailwind’s current documentation. - Verify the production build. Confirm that representative component styles are present in the generated CSS, not just during local development.
Tailwind’s official homepage identifies the current series as Tailwind CSS v4.3 and describes generated CSS as based on classes in scanned content. Because source detection and installation details are version-sensitive, use the documentation for the version actually in the project.
Do not confuse package size with the app’s shipped bundle
daisyUI’s v5 release notes report two vendor comparisons with its previous release: a 61% reduction in npm package install size, and a 75% reduction in the full CDN CSS file, which the notes say changed from 137 kB to 34 kB. Those figures describe different things. Neither establishes how much CSS or JavaScript a specific application ships after its own build.
For an app-level decision, measure the production output that matters: generated CSS, JavaScript bundles, and any runtime behavior layer actually included. A package’s install footprint or a full CDN stylesheet is not interchangeable with those measurements. The published v5 comparisons are vendor claims, not an independent comparison against Flowbite or another library.
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Tailwind Plus status and naming context
Tailwind UI was renamed Tailwind Plus in March 2025. At that time, Adam Wathan said its one-time purchase and lifetime-access model and pricing were not changing. That announcement describes the offer then, not current sign-up availability.
On September 9, 2026, Tailwind Labs announced it was joining Shopify and closing sign-ups for new Tailwind Plus customers; it said existing customers would retain access to products including Tailwind Plus and ui.sh. A new project should check the current official status rather than treating an earlier purchase announcement as evidence that sign-ups remain open.
A practical way to choose
- Choose CSS-first styling when your team wants component-level visual conventions but prefers to own interactions in the app or choose a separate behavior layer.
- Choose a behavior-supplying library when its interaction patterns reduce work and fit your framework, accessibility requirements, and design constraints.
- Compare actual production output rather than inferring app performance from package size or a vendor’s full-stylesheet comparison.
- Verify integration and product status against the current Tailwind and library documentation, especially source scanning and sign-up availability.
Tailwind Labs reported over 110 million Tailwind installations per week in its September 2026 announcement. That is an installation rate reported by the company, not a count of unique users and not evidence that one component-library architecture is best for every project.
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