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basecoat

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Mis à jour20 juillet 2026 à 12:43

Build frontend UIs with BasecoatUI — a framework-agnostic Tailwind CSS component library compatible with shadcn/ui themes. Reference all 41 components, JS requirements, data-attributes, CDN usage, themes, and Jinja/Nunjucks macros.

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SKILL.md

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Exécutez n'importe quel Skill en un clic

name	basecoat
description	Build frontend UIs with BasecoatUI — a framework-agnostic Tailwind CSS component library compatible with shadcn/ui themes. Reference all 41 components, JS requirements, data-attributes, CDN usage, themes, and Jinja/Nunjucks macros.

BasecoatUI

BasecoatUI (package basecoat-css) is a framework-agnostic component library by Ronan Berder (hunvreus/basecoat). It brings the shadcn/ui design philosophy to non-React stacks: pre-styled, accessible HTML components built on Tailwind CSS v4, with a small vanilla-JS runtime for interactive components.

This skill covers basecoat-css@1.0.2. Verified by rendering a page with the CDN and screenshotting it.

1. Install

npm + Tailwind v4

npm install basecoat-css

In your CSS entry (Tailwind v4):

@import "tailwindcss";
@import "basecoat-css";
/* default Vega bundle */
/* or @import "basecoat-css/maia"; */
/* named style pack */

For interactive components, load the JS:

<script defer="" src="https://cdn.jsdelivr.net/npm/basecoat-css@1.0.2/dist/js/all.min.js">
</script>

Or import from a bundler:

import "basecoat-css/all"; /* all interactive components */

CDN (plain HTML / quick prototype)

<link href="https://cdn.jsdelivr.net/npm/basecoat-css@1.0.2/dist/basecoat.cdn.min.css" rel="stylesheet"/>
<script defer="" src="https://cdn.jsdelivr.net/npm/basecoat-css@1.0.2/dist/js/all.min.js">
</script>

Named style pack (e.g. maia):

<link href="https://cdn.jsdelivr.net/npm/basecoat-css@1.0.2/dist/basecoat-maia.cdn.min.css" rel="stylesheet"/>

2. Render a quick preview

Save this as basecoat-preview.html, then open it:

cat > basecoat-preview.html <<'EOF'
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>Basecoat preview</title>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/basecoat-css@1.0.2/dist/basecoat.cdn.min.css" />
  <script src="https://cdn.jsdelivr.net/npm/basecoat-css@1.0.2/dist/js/all.min.js" defer></script>
</head>
<body class="bg-background text-foreground p-8 max-w-3xl mx-auto space-y-8">
  <h1 class="text-3xl font-bold">Basecoat preview</h1>

  <section class="space-y-2">
    <h2 class="text-xl font-semibold">Buttons</h2>
    <div class="flex flex-wrap gap-2">
      <button class="btn">Default</button>
      <button class="btn" data-variant="secondary">Secondary</button>
      <button class="btn" data-variant="outline">Outline</button>
      <button class="btn" data-variant="destructive">Destructive</button>
      <button class="btn" data-variant="ghost">Ghost</button>
      <button class="btn" data-variant="link">Link</button>
    </div>
  </section>

  <section class="space-y-2">
    <h2 class="text-xl font-semibold">Badges</h2>
    <div class="flex flex-wrap gap-2">
      <span class="badge">Default</span>
      <span class="badge" data-variant="secondary">Secondary</span>
      <span class="badge" data-variant="destructive">Destructive</span>
      <span class="badge" data-variant="outline">Outline</span>
    </div>
  </section>

  <section class="space-y-2">
    <h2 class="text-xl font-semibold">Card + form</h2>
    <div class="card">
      <header><h2>Login</h2><p>Enter your email below.</p></header>
      <section>
        <form class="grid gap-4">
          <div class="grid gap-2">
            <label class="label" for="email">Email</label>
            <input class="input" id="email" type="email" placeholder="m@example.com" />
          </div>
          <div class="grid gap-2">
            <label class="label" for="password">Password</label>
            <input class="input" id="password" type="password" />
          </div>
        </form>
      </section>
      <footer><button class="btn w-full">Login</button></footer>
    </div>
  </section>

  <section class="space-y-2">
    <h2 class="text-xl font-semibold">Select (JS)</h2>
    <div id="fruit" class="select w-60" data-placeholder="Pick a fruit">
      <button type="button" id="fruit-trigger" aria-haspopup="listbox" aria-expanded="false" aria-controls="fruit-listbox" class="w-full">
        <span class="truncate">Pick a fruit</span>
      </button>
      <div data-popover aria-hidden="true">
        <div role="listbox" id="fruit-listbox" aria-labelledby="fruit-trigger">
          <div role="option" data-value="apple">Apple</div>
          <div role="option" data-value="banana">Banana</div>
          <div role="option" data-value="grapes">Grapes</div>
        </div>
      </div>
      <input type="hidden" name="fruit" value="" />
    </div>
  </section>

  <section class="space-y-2">
    <h2 class="text-xl font-semibold">Table</h2>
    <div class="table-container">
      <table class="table">
        <thead><tr><th>Invoice</th><th>Status</th><th class="text-end">Amount</th></tr></thead>
        <tbody>
          <tr><td class="font-medium">INV001</td><td>Paid</td><td class="text-end">$250.00</td></tr>
          <tr><td class="font-medium">INV002</td><td>Pending</td><td class="text-end">$150.00</td></tr>
        </tbody>
      </table>
    </div>
  </section>
</body>
</html>
EOF
python3 -m http.server 8765 --bind 127.0.0.1 &
chromium-cli screenshot http://127.0.0.1:8765/basecoat-preview.html

3. Anatomy of a Basecoat component

Most components follow this shape:

Root class — e.g. btn, card, table. Apply it to the root element.
Semantic structure — many components use child <header>, <section>, <footer> (cards, dialogs, popovers).
Variants / sizes / state via data-* attributes — e.g. data-variant="outline", data-size="sm".
ARIA roles — the docs rely on native semantics plus explicit roles (role="tablist", role="menu", role="listbox", etc.).
Tailwind utilities — Basecoat uses your Tailwind configuration, so utilities like w-full, flex, gap-2 continue to work.

Common variants: default, secondary, destructive, outline, ghost, link. Common sizes: default, sm, lg, icon, icon-sm. Not every component supports all of these; check the component page for its specific set.

4. Component catalog (41 components)

Component	Root class	Needs JS	Key `data-*` attributes	Minimal example
Accordion	`accordion`	✅ `accordion.min.js`	`data-multiple`	`<section class="accordion"><details><summary>Q1</summary><section>A1</section></details></section>`
Alert Dialog	`alert-dialog` on `<dialog>`	❌ (native `<dialog>`)	`data-size`, `data-variant`	`<dialog class="alert-dialog"><div><header><h2>Title</h2><p>Description</p></header><footer><button class="btn">OK</button></footer></div></dialog>`
Alert	`alert`	❌	`data-size`, `data-variant`	`<div class="alert" data-variant="destructive"><h2>Error</h2><section>Message</section></div>`
Avatar	`avatar`, `avatar-group`	❌	`data-size`, `data-variant`, `data-popover`, `data-count`	`<span class="avatar"><img src="u.png" alt="User" /><span>CN</span></span>`
Badge	`badge`	❌	`data-variant`, `data-icon`	`<span class="badge" data-variant="secondary">New</span>`
Breadcrumb	`breadcrumb`	❌	`data-size`, `data-variant`, `data-popover`, `data-rtl-flip`	`<nav class="breadcrumb" aria-label="Breadcrumb"><ol><li><a href="#">Home</a></li><li aria-hidden="true">/</li><li><span aria-current="page">Current</span></li></ol></nav>`
Button Group	`button-group`	❌	`data-orientation`, `data-size`, `data-variant`, `data-align`, `data-label`, `data-name`, `data-value`, `data-popover`	`<div role="group" class="button-group"><button class="btn" data-variant="outline">A</button><button class="btn" data-variant="outline">B</button></div>`
Button	`btn`	❌	`data-variant`, `data-size`, `data-icon`, `data-popover`, `data-align`	`<button class="btn" data-variant="outline" data-size="sm">Save</button>`
Card	`card`	❌	`data-size`, `data-variant`	`<div class="card"><header><h2>Title</h2></header><section>Body</section><footer>Footer</footer></div>`
Chart	`<canvas>`	✅ `basecoat.min.js` + `chart.umd.min.js` + `chart.min.js` (Chart.js not bundled)	—	See docs; not included in `all.min.js`.
Checkbox	`input` (on `<input type="checkbox">`)	❌	`data-orientation`, `data-variant`, `data-disabled`, `data-invalid`, `data-slot="checkbox-table"`	`<div role="group" class="field" data-orientation="horizontal"><input type="checkbox" id="c1" class="input" /><label for="c1">Accept</label></div>`
Combobox	`combobox`	✅ `combobox.min.js`	`data-clear`, `data-auto-highlight`, `data-filter`, `data-format`, `data-invalid`, `data-label`, `data-placeholder`, `data-popover`, `data-side`, `data-size`, `data-value`, `data-variant`	See full example below in JS components.
Command	`command`	✅ `command.min.js`	`data-empty`, `data-filter`, `data-force`, `data-keep-command-open`, `data-keywords`, `data-shortcut`, `data-checked`, `data-disabled`, `data-indicator`, `data-variant`	See full example below in JS components.
Dialog	`dialog` on `<dialog>`	❌ (native `<dialog>`)	`data-size`, `data-variant`	`<dialog class="dialog"><div><header><h2>Edit</h2></header><section>Form</section><footer><button class="btn">Save</button></footer></div></dialog>`
Drawer	`drawer` on `<dialog>`	✅ `drawer.min.js`	`data-side`, `data-size`, `data-variant`, `data-drawer-initialized`	`<dialog class="drawer"><article><header><h2>Title</h2></header><section>Body</section><footer><button class="btn">OK</button></footer></article></dialog>`
Dropdown Menu	`dropdown-menu`	✅ `dropdown-menu.min.js`	`data-align`, `data-side`, `data-size`, `data-variant`, `data-popover`, `data-indicator`	See full example below in JS components.
Empty	`empty`	❌	`data-align`, `data-icon`, `data-size`, `data-variant`	`<section class="empty"><header><figure></figure><h3>No items</h3><p>Add one to get started.</p></header><footer><button class="btn">Create</button></footer></section>`
Field	`field`	❌	`data-orientation`, `data-variant`, `data-disabled`, `data-invalid`	`<div role="group" class="field"><label for="x">Name</label><input id="x" class="input" /></div>`
Input Group	`input-group`	❌	`data-align`, `data-control`, `data-orientation`, `data-popover`, `data-size`, `data-variant`	`<div class="input-group"><span>$</span><input class="input" type="text" /></div>`
Input	`input`	❌	`data-size`, `data-variant`	`<input class="input" type="email" placeholder="Email" />`
Item	`item`	❌	`data-size`, `data-variant`, `data-align`, `data-icon`, `data-popover`	`<article class="item"><section><h3>Title</h3><p>Desc</p></section><aside><button class="btn" data-size="sm">Action</button></aside></article>`
Kbd	`kbd`	❌	`data-variant`, `data-size`, `data-align`, `data-icon`	`<kbd>⌘K</kbd>`
Label	`label`	❌	—	`<label class="label" for="id">Email</label>`
Native Select	`select` on `<select>`	❌	`data-size`, `data-invalid`	`<select class="select w-full"><option>One</option><option>Two</option></select>`
Pagination	uses `btn`	❌	`data-size`, `data-variant`	`<nav aria-label="pagination"><ul class="flex gap-1"><li><a class="btn" data-size="icon" href="#">1</a></li></ul></nav>`
Popover	`popover`	✅ `popover.min.js`	`data-align`, `data-side`, `data-variant`, `data-popover`	See full example below in JS components.
Progress	`progress`	❌	—	`<div class="progress" role="progressbar"><span style="width: 66%"></span></div>`
Radio Group	`input` (on `<input type="radio">`)	❌	`data-orientation`, `data-variant`, `data-disabled`, `data-invalid`, `data-slot="radio-group"`	`<div role="radiogroup"><div class="flex gap-3"><input type="radio" id="r1" name="g" class="input" /><label for="r1">Yes</label></div></div>`
Scroll Area	`scrollbar`	❌	—	`<div class="scrollbar h-48 overflow-y-auto">Long content…</div>`
Select	`select` on `<div>`	✅ `select.min.js`	`data-align`, `data-close-on-select`, `data-format`, `data-invalid`, `data-label`, `data-placeholder`, `data-popover`, `data-side`, `data-size`, `data-value`, `data-variant`	See full example below in JS components.
Sidebar	`sidebar`	✅ `sidebar.min.js`	`data-side`, `data-size`, `data-variant`, `data-breakpoint`, `data-active`, `data-initial-open`, `data-initial-mobile-open`, `data-keep-mobile-sidebar-open`	See docs / use `sidebar()` macro.
Skeleton	`skeleton`	❌	—	`<div class="skeleton h-4 w-48 rounded"></div>`
Slider	`input` (on `<input type="range">`)	✅ `range.min.js`	—	`<input type="range" class="input w-full" min="0" max="100" value="50" />`
Spinner	none (pure Tailwind)	❌	—	Not a component. Use a Lucide loader icon with `animate-spin`: `<svg class="animate-spin lucide lucide-loader-circle" … />`
Switch	`input` (on `<input type="checkbox" role="switch">`)	❌	`data-size`, `data-variant`, `data-orientation`, `data-disabled`, `data-invalid`	`<div role="group" class="field" data-orientation="horizontal"><input type="checkbox" id="s1" role="switch" class="input" /><label for="s1">Airplane mode</label></div>`
Table	`table` on `<table>`	❌	`data-size`, `data-variant`	`<div class="table-container"><table class="table">…</table></div>`
Tabs	`tabs`	✅ `tabs.min.js`	`data-variant`	See full example below in JS components.
Textarea	`textarea`	❌	—	`<textarea class="textarea" placeholder="Type…"></textarea>`
Theme Switcher	`theme-switcher` (or use `window.basecoat.theme.toggle()`)	✅ `basecoat.min.js` (part of `all.min.js`)	`data-side`, `data-size`, `data-tooltip`, `data-variant`	`<button class="btn" data-size="icon" data-tooltip="Toggle dark mode" onclick="window.basecoat.theme.toggle()">🌙</button>`
Toast	`toast`	✅ `toast.min.js`	`data-align`, `data-category`, `data-duration`, `data-toast-action`, `data-variant`	See docs / use `toast()`/`toaster()` macros.
Tooltip	any element	❌	`data-tooltip`, `data-side`, `data-align`, `data-size`	`<button class="btn" data-tooltip="Add to library">Hover</button>`

5. JavaScript components (interactive)

Only 13 of the 41 components need the Basecoat runtime. Load the full bundle (all.min.js) or the runtime + per-component script.

Component	Required JS (runtime + component)	Notes
Accordion	`basecoat.min.js` + `accordion.min.js`	Native `<details>` enhanced. `data-multiple` allows multiple open panels.
Combobox	`basecoat.min.js` + `combobox.min.js`	Searchable dropdown with `role="combobox"`.
Command	`basecoat.min.js` + `command.min.js`	Command palette / filterable menu.
Drawer	`basecoat.min.js` + `drawer.min.js`	Slides out from `data-side` (`left`/`right`/`top`/`bottom`).
Dropdown Menu	`basecoat.min.js` + `dropdown-menu.min.js`
Popover	`basecoat.min.js` + `popover.min.js`
Select	`basecoat.min.js` + `select.min.js`	Custom-styled, accessible dropdown.
Sidebar	`basecoat.min.js` + `sidebar.min.js`	Collapsible layout sidebar.
Slider	`basecoat.min.js` + `range.min.js`	Note: file is named `range.min.js`, not `slider.min.js`.
Tabs	`basecoat.min.js` + `tabs.min.js`
Theme Switcher	`basecoat.min.js` (in `all.min.js`)	Exposes `window.basecoat.theme.toggle()`.
Toast	`basecoat.min.js` + `toast.min.js`	Usually rendered server-side via HTMX or macro.
Chart	`basecoat.min.js` + `chart.min.js` + `chart.umd.min.js`	Not in `all.min.js`; Chart.js is a separate peer dependency.

Select example

<div class="select w-60" data-placeholder="Theme" id="theme">
 <button aria-controls="theme-listbox" aria-expanded="false" aria-haspopup="listbox" class="w-full" id="theme-trigger" type="button">
  <span class="truncate">
   Theme
  </span>
 </button>
 <div aria-hidden="true" data-popover="">
  <div aria-labelledby="theme-trigger" id="theme-listbox" role="listbox">
   <div data-value="light" role="option">
    Light
   </div>
   <div data-value="dark" role="option">
    Dark
   </div>
  </div>
 </div>
 <input name="theme" type="hidden" value=""/>
</div>

Dropdown Menu example

<div class="dropdown-menu" id="menu">
 <button aria-controls="menu-menu" aria-expanded="false" aria-haspopup="menu" class="btn" data-variant="outline" id="menu-trigger" type="button">
  Open
 </button>
 <div aria-hidden="true" data-align="end" data-popover="" id="menu-popover">
  <div aria-labelledby="menu-trigger" id="menu-menu" role="menu">
   <div role="group">
    <div role="heading">
     My Account
    </div>
    <div role="menuitem">
     <span>
      Profile
     </span>
     <kbd>
      ⇧⌘P
     </kbd>
    </div>
    <div role="menuitem">
     <span>
      Billing
     </span>
     <kbd>
      ⌘B
     </kbd>
    </div>
   </div>
   <hr role="separator"/>
   <div role="group">
    <div role="menuitem">
     Log out
    </div>
   </div>
  </div>
 </div>
</div>

Tabs example

<div class="tabs" id="tabs">
 <nav aria-orientation="horizontal" role="tablist">
  <button aria-controls="tabs-p1" aria-selected="true" id="tabs-1" role="tab" tabindex="0" type="button">
   Account
  </button>
  <button aria-controls="tabs-p2" aria-selected="false" id="tabs-2" role="tab" tabindex="-1" type="button">
   Password
  </button>
 </nav>
 <div aria-labelledby="tabs-1" aria-selected="true" id="tabs-p1" role="tabpanel" tabindex="-1">
  Account content
 </div>
 <div aria-labelledby="tabs-2" aria-selected="false" hidden="" id="tabs-p2" role="tabpanel" tabindex="-1">
  Password content
 </div>
</div>

Combobox example

<div class="combobox" id="combo">
 <input aria-autocomplete="list" aria-controls="combo-listbox" aria-expanded="false" autocomplete="off" placeholder="Select…" role="combobox" type="text"/>
 <div aria-hidden="true" data-popover="">
  <div data-empty="No items found." id="combo-listbox" role="listbox">
   <div data-value="a" role="option">
    A
   </div>
   <div data-value="b" role="option">
    B
   </div>
  </div>
 </div>
 <input name="combo" type="hidden" value=""/>
</div>

Command example

<div aria-label="Command menu" class="command border">
 <header>
  <input aria-autocomplete="list" aria-controls="cmd-menu" aria-expanded="true" autocomplete="off" placeholder="Type a command…" role="combobox" type="text"/>
 </header>
 <div data-empty="No results found." id="cmd-menu" role="menu">
  <div role="group">
   <span role="heading">
    Suggestions
   </span>
   <div data-filter="Calendar" data-keywords="date event" role="menuitem">
    Calendar
   </div>
  </div>
 </div>
</div>

Dialog / Drawer (native `<dialog>`)

Dialog, Alert Dialog, and Drawer do not need Basecoat JS. Use the native HTML <dialog> API:

<button class="btn" data-variant="outline" onclick="document.getElementById('dlg').showModal()">
 Open
</button>
<dialog class="dialog" id="dlg" onclick="if (event.target === this) this.close()">
 <div class="sm:max-w-sm">
  <header>
   <h2>
    Edit profile
   </h2>
  </header>
  <section>
   Make changes here.
  </section>
  <footer>
   <button class="btn" data-variant="outline" onclick="this.closest('dialog').close()">
    Cancel
   </button>
   <button class="btn" onclick="this.closest('dialog').close()">
    Save
   </button>
  </footer>
 </div>
</dialog>

For drawer, use <dialog class="drawer"> with an <article> child and data-side.

6. Jinja / Nunjucks macros

Basecoat ships 11 optional macros for server-rendered apps. Import them from the basecoat-css package templates path (or copy the templates into your project). These are especially useful for Select, Combobox, Dropdown Menu, Sidebar, Tabs, and Toast.

Macro	Arguments	Covers
`combobox()`	`id`, `selected`, `name`, `multiple`, `placeholder`, `close_on_select`, `clear`, `auto_highlight`, `format`, `main_attrs`, `input_attrs`, `popover_attrs`, `listbox_attrs`, `hidden_input_attrs`	Combobox
`command()`	`id`, `items`, `placeholder`, `empty_text`, `main_attrs`, `input_attrs`, `menu_attrs`	Command palette
`command_dialog()`	`id`, `items`, `placeholder`, `empty_text`, `dialog_attrs`, `input_attrs`, `menu_attrs`, `open`	Command palette in a dialog
`dialog()`	`id`, `trigger`, `title`, `description`, `footer`, `dialog_attrs`, `trigger_attrs`, `header_attrs`, `body_attrs`, `footer_attrs`, `open`, `close_button`, `close_on_overlay_click`	Dialog
`dropdown_menu()`	`trigger`, `id`, `items`, `main_attrs`, `trigger_attrs`, `popover_attrs`, `menu_attrs`	Dropdown Menu
`popover()`	`trigger`, `id`, `main_attrs`, `trigger_attrs`, `popover_attrs`	Popover
`select()`	`id`, `selected`, `name`, `items`, `multiple`, `placeholder`, `close_on_select`, `format`, `main_attrs`, `trigger_attrs`, `popover_attrs`, `listbox_attrs`, `input_attrs`	Select
`sidebar()`	`id`, `label`, `open`, `side`, `header`, `footer`, `menu`, `main_attrs`, `header_attrs`, `content_attrs`, `footer_attrs`	Sidebar
`tabs()`	`id`, `tabsets`, `main_attrs`, `tablist_attrs`, `default_tab_index`	Tabs
`toast()`	`category`, `title`, `description`, `duration`, `icon`, `action`, `cancel`, `attrs`	Individual toast
`toaster()`	`id`, `toasts`, `attrs`	Toast container

See site/src/docs/templates.mdx in the hunvreus/basecoat repo for full signatures and examples.

7. Themes / style packs

Basecoat separates component structure from visual style. You can use:

A full bundle: @import "basecoat-css"; (default Vega)
A named style pack: @import "basecoat-css/maia";
Base only + your own style: @import "basecoat-css/base.css"; then @import "./style-acme.css";
Base + one component + one style: @import "basecoat-css/components/button.css"; @import "basecoat-css/styles/vega.css";

Built-in style packs: vega, nova, maia, lyra, mira, luma, sera, rhea.

To create a custom theme, write CSS variables in the same structure as src/css/styles/<pack>.css in the Basecoat repo.

8. Gotchas

“Needs JS” means Basecoat JS. Many components are purely CSS (btn, card, input, table, alert, badge, tooltip). Do not import JS for them. The 13 JS components are listed in §5.
Native Select vs. custom Select. Both use the class select, but Native Select is <select class="select"> (no JS), while Select is <div class="select"> (requires JS).
Checkbox / Radio / Switch all use class="input". Do not invent class="checkbox". Style variants and state come from data-* attributes on the surrounding field or from the native element.
Dialog/Alert Dialog/Drawer use native <dialog>. Open them with .showModal() and close with .close(). No Basecoat JS runtime is required, though Drawer needs drawer.min.js for extra behavior.
Slider JS file is range.min.js. It is named after the range input, not the component.
Chart is not in all.min.js. It needs Chart.js (chart.umd.min.js) plus Basecoat's chart.min.js.
Spinner is not a component. It is a plain Lucide lucide-loader-circle icon with animate-spin. No Basecoat CSS file exists.
Scroll Area uses scrollbar, not scroll-area. Apply class="scrollbar" to the scrollable container.
Load Basecoat CSS after Tailwind. The docs explicitly say: load Basecoat after any stylesheet containing Tailwind base/preflight.
SVG icons are not provided. The docs use Lucide icons. Use <svg class="lucide lucide-icon-name"> or your own icon set.
No test suite. Use pre-commit/ruff for quality; do not write Django-style tests for the markup.

9. External links

Homepage: https://basecoatui.com/
GitHub: https://github.com/hunvreus/basecoat
npm: https://www.npmjs.com/package/basecoat-css
Intro: https://basecoatui.com/introduction/
Install: https://basecoatui.com/installation/
Components index: https://basecoatui.com/components/

name	basecoat
description	Build frontend UIs with BasecoatUI — a framework-agnostic Tailwind CSS component library compatible with shadcn/ui themes. Reference all 41 components, JS requirements, data-attributes, CDN usage, themes, and Jinja/Nunjucks macros.

BasecoatUI

This skill covers basecoat-css@1.0.2. Verified by rendering a page with the CDN and screenshotting it.

1. Install

npm + Tailwind v4

npm install basecoat-css

In your CSS entry (Tailwind v4):

@import "tailwindcss";
@import "basecoat-css";
/* default Vega bundle */
/* or @import "basecoat-css/maia"; */
/* named style pack */

For interactive components, load the JS:

<script defer="" src="https://cdn.jsdelivr.net/npm/basecoat-css@1.0.2/dist/js/all.min.js">
</script>

Or import from a bundler:

import "basecoat-css/all"; /* all interactive components */

CDN (plain HTML / quick prototype)

<link href="https://cdn.jsdelivr.net/npm/basecoat-css@1.0.2/dist/basecoat.cdn.min.css" rel="stylesheet"/>
<script defer="" src="https://cdn.jsdelivr.net/npm/basecoat-css@1.0.2/dist/js/all.min.js">
</script>

Named style pack (e.g. maia):

<link href="https://cdn.jsdelivr.net/npm/basecoat-css@1.0.2/dist/basecoat-maia.cdn.min.css" rel="stylesheet"/>

2. Render a quick preview

Save this as basecoat-preview.html, then open it:

cat > basecoat-preview.html <<'EOF'
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1" />
  <title>Basecoat preview</title>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/basecoat-css@1.0.2/dist/basecoat.cdn.min.css" />
  <script src="https://cdn.jsdelivr.net/npm/basecoat-css@1.0.2/dist/js/all.min.js" defer></script>
</head>
<body class="bg-background text-foreground p-8 max-w-3xl mx-auto space-y-8">
  <h1 class="text-3xl font-bold">Basecoat preview</h1>

  <section class="space-y-2">
    <h2 class="text-xl font-semibold">Buttons</h2>
    <div class="flex flex-wrap gap-2">
      <button class="btn">Default</button>
      <button class="btn" data-variant="secondary">Secondary</button>
      <button class="btn" data-variant="outline">Outline</button>
      <button class="btn" data-variant="destructive">Destructive</button>
      <button class="btn" data-variant="ghost">Ghost</button>
      <button class="btn" data-variant="link">Link</button>
    </div>
  </section>

  <section class="space-y-2">
    <h2 class="text-xl font-semibold">Badges</h2>
    <div class="flex flex-wrap gap-2">
      <span class="badge">Default</span>
      <span class="badge" data-variant="secondary">Secondary</span>
      <span class="badge" data-variant="destructive">Destructive</span>
      <span class="badge" data-variant="outline">Outline</span>
    </div>
  </section>

  <section class="space-y-2">
    <h2 class="text-xl font-semibold">Card + form</h2>
    <div class="card">
      <header><h2>Login</h2><p>Enter your email below.</p></header>
      <section>
        <form class="grid gap-4">
          <div class="grid gap-2">
            <label class="label" for="email">Email</label>
            <input class="input" id="email" type="email" placeholder="m@example.com" />
          </div>
          <div class="grid gap-2">
            <label class="label" for="password">Password</label>
            <input class="input" id="password" type="password" />
          </div>
        </form>
      </section>
      <footer><button class="btn w-full">Login</button></footer>
    </div>
  </section>

  <section class="space-y-2">
    <h2 class="text-xl font-semibold">Select (JS)</h2>
    <div id="fruit" class="select w-60" data-placeholder="Pick a fruit">
      <button type="button" id="fruit-trigger" aria-haspopup="listbox" aria-expanded="false" aria-controls="fruit-listbox" class="w-full">
        <span class="truncate">Pick a fruit</span>
      </button>
      <div data-popover aria-hidden="true">
        <div role="listbox" id="fruit-listbox" aria-labelledby="fruit-trigger">
          <div role="option" data-value="apple">Apple</div>
          <div role="option" data-value="banana">Banana</div>
          <div role="option" data-value="grapes">Grapes</div>
        </div>
      </div>
      <input type="hidden" name="fruit" value="" />
    </div>
  </section>

  <section class="space-y-2">
    <h2 class="text-xl font-semibold">Table</h2>
    <div class="table-container">
      <table class="table">
        <thead><tr><th>Invoice</th><th>Status</th><th class="text-end">Amount</th></tr></thead>
        <tbody>
          <tr><td class="font-medium">INV001</td><td>Paid</td><td class="text-end">$250.00</td></tr>
          <tr><td class="font-medium">INV002</td><td>Pending</td><td class="text-end">$150.00</td></tr>
        </tbody>
      </table>
    </div>
  </section>
</body>
</html>
EOF
python3 -m http.server 8765 --bind 127.0.0.1 &
chromium-cli screenshot http://127.0.0.1:8765/basecoat-preview.html

3. Anatomy of a Basecoat component

Most components follow this shape:

Root class — e.g. btn, card, table. Apply it to the root element.
Semantic structure — many components use child <header>, <section>, <footer> (cards, dialogs, popovers).
Variants / sizes / state via data-* attributes — e.g. data-variant="outline", data-size="sm".
ARIA roles — the docs rely on native semantics plus explicit roles (role="tablist", role="menu", role="listbox", etc.).
Tailwind utilities — Basecoat uses your Tailwind configuration, so utilities like w-full, flex, gap-2 continue to work.

4. Component catalog (41 components)

Component	Root class	Needs JS	Key `data-*` attributes	Minimal example
Accordion	`accordion`	✅ `accordion.min.js`	`data-multiple`	`<section class="accordion"><details><summary>Q1</summary><section>A1</section></details></section>`
Alert Dialog	`alert-dialog` on `<dialog>`	❌ (native `<dialog>`)	`data-size`, `data-variant`	`<dialog class="alert-dialog"><div><header><h2>Title</h2><p>Description</p></header><footer><button class="btn">OK</button></footer></div></dialog>`
Alert	`alert`	❌	`data-size`, `data-variant`	`<div class="alert" data-variant="destructive"><h2>Error</h2><section>Message</section></div>`
Avatar	`avatar`, `avatar-group`	❌	`data-size`, `data-variant`, `data-popover`, `data-count`	`<span class="avatar"><img src="u.png" alt="User" /><span>CN</span></span>`
Badge	`badge`	❌	`data-variant`, `data-icon`	`<span class="badge" data-variant="secondary">New</span>`
Breadcrumb	`breadcrumb`	❌	`data-size`, `data-variant`, `data-popover`, `data-rtl-flip`	`<nav class="breadcrumb" aria-label="Breadcrumb"><ol><li><a href="#">Home</a></li><li aria-hidden="true">/</li><li><span aria-current="page">Current</span></li></ol></nav>`
Button Group	`button-group`	❌	`data-orientation`, `data-size`, `data-variant`, `data-align`, `data-label`, `data-name`, `data-value`, `data-popover`	`<div role="group" class="button-group"><button class="btn" data-variant="outline">A</button><button class="btn" data-variant="outline">B</button></div>`
Button	`btn`	❌	`data-variant`, `data-size`, `data-icon`, `data-popover`, `data-align`	`<button class="btn" data-variant="outline" data-size="sm">Save</button>`
Card	`card`	❌	`data-size`, `data-variant`	`<div class="card"><header><h2>Title</h2></header><section>Body</section><footer>Footer</footer></div>`
Chart	`<canvas>`	✅ `basecoat.min.js` + `chart.umd.min.js` + `chart.min.js` (Chart.js not bundled)	—	See docs; not included in `all.min.js`.
Checkbox	`input` (on `<input type="checkbox">`)	❌	`data-orientation`, `data-variant`, `data-disabled`, `data-invalid`, `data-slot="checkbox-table"`	`<div role="group" class="field" data-orientation="horizontal"><input type="checkbox" id="c1" class="input" /><label for="c1">Accept</label></div>`
Combobox	`combobox`	✅ `combobox.min.js`	`data-clear`, `data-auto-highlight`, `data-filter`, `data-format`, `data-invalid`, `data-label`, `data-placeholder`, `data-popover`, `data-side`, `data-size`, `data-value`, `data-variant`	See full example below in JS components.
Command	`command`	✅ `command.min.js`	`data-empty`, `data-filter`, `data-force`, `data-keep-command-open`, `data-keywords`, `data-shortcut`, `data-checked`, `data-disabled`, `data-indicator`, `data-variant`	See full example below in JS components.
Dialog	`dialog` on `<dialog>`	❌ (native `<dialog>`)	`data-size`, `data-variant`	`<dialog class="dialog"><div><header><h2>Edit</h2></header><section>Form</section><footer><button class="btn">Save</button></footer></div></dialog>`
Drawer	`drawer` on `<dialog>`	✅ `drawer.min.js`	`data-side`, `data-size`, `data-variant`, `data-drawer-initialized`	`<dialog class="drawer"><article><header><h2>Title</h2></header><section>Body</section><footer><button class="btn">OK</button></footer></article></dialog>`
Dropdown Menu	`dropdown-menu`	✅ `dropdown-menu.min.js`	`data-align`, `data-side`, `data-size`, `data-variant`, `data-popover`, `data-indicator`	See full example below in JS components.
Empty	`empty`	❌	`data-align`, `data-icon`, `data-size`, `data-variant`	`<section class="empty"><header><figure></figure><h3>No items</h3><p>Add one to get started.</p></header><footer><button class="btn">Create</button></footer></section>`
Field	`field`	❌	`data-orientation`, `data-variant`, `data-disabled`, `data-invalid`	`<div role="group" class="field"><label for="x">Name</label><input id="x" class="input" /></div>`
Input Group	`input-group`	❌	`data-align`, `data-control`, `data-orientation`, `data-popover`, `data-size`, `data-variant`	`<div class="input-group"><span>$</span><input class="input" type="text" /></div>`
Input	`input`	❌	`data-size`, `data-variant`	`<input class="input" type="email" placeholder="Email" />`
Item	`item`	❌	`data-size`, `data-variant`, `data-align`, `data-icon`, `data-popover`	`<article class="item"><section><h3>Title</h3><p>Desc</p></section><aside><button class="btn" data-size="sm">Action</button></aside></article>`
Kbd	`kbd`	❌	`data-variant`, `data-size`, `data-align`, `data-icon`	`<kbd>⌘K</kbd>`
Label	`label`	❌	—	`<label class="label" for="id">Email</label>`
Native Select	`select` on `<select>`	❌	`data-size`, `data-invalid`	`<select class="select w-full"><option>One</option><option>Two</option></select>`
Pagination	uses `btn`	❌	`data-size`, `data-variant`	`<nav aria-label="pagination"><ul class="flex gap-1"><li><a class="btn" data-size="icon" href="#">1</a></li></ul></nav>`
Popover	`popover`	✅ `popover.min.js`	`data-align`, `data-side`, `data-variant`, `data-popover`	See full example below in JS components.
Progress	`progress`	❌	—	`<div class="progress" role="progressbar"><span style="width: 66%"></span></div>`
Radio Group	`input` (on `<input type="radio">`)	❌	`data-orientation`, `data-variant`, `data-disabled`, `data-invalid`, `data-slot="radio-group"`	`<div role="radiogroup"><div class="flex gap-3"><input type="radio" id="r1" name="g" class="input" /><label for="r1">Yes</label></div></div>`
Scroll Area	`scrollbar`	❌	—	`<div class="scrollbar h-48 overflow-y-auto">Long content…</div>`
Select	`select` on `<div>`	✅ `select.min.js`	`data-align`, `data-close-on-select`, `data-format`, `data-invalid`, `data-label`, `data-placeholder`, `data-popover`, `data-side`, `data-size`, `data-value`, `data-variant`	See full example below in JS components.
Sidebar	`sidebar`	✅ `sidebar.min.js`	`data-side`, `data-size`, `data-variant`, `data-breakpoint`, `data-active`, `data-initial-open`, `data-initial-mobile-open`, `data-keep-mobile-sidebar-open`	See docs / use `sidebar()` macro.
Skeleton	`skeleton`	❌	—	`<div class="skeleton h-4 w-48 rounded"></div>`
Slider	`input` (on `<input type="range">`)	✅ `range.min.js`	—	`<input type="range" class="input w-full" min="0" max="100" value="50" />`
Spinner	none (pure Tailwind)	❌	—	Not a component. Use a Lucide loader icon with `animate-spin`: `<svg class="animate-spin lucide lucide-loader-circle" … />`
Switch	`input` (on `<input type="checkbox" role="switch">`)	❌	`data-size`, `data-variant`, `data-orientation`, `data-disabled`, `data-invalid`	`<div role="group" class="field" data-orientation="horizontal"><input type="checkbox" id="s1" role="switch" class="input" /><label for="s1">Airplane mode</label></div>`
Table	`table` on `<table>`	❌	`data-size`, `data-variant`	`<div class="table-container"><table class="table">…</table></div>`
Tabs	`tabs`	✅ `tabs.min.js`	`data-variant`	See full example below in JS components.
Textarea	`textarea`	❌	—	`<textarea class="textarea" placeholder="Type…"></textarea>`
Theme Switcher	`theme-switcher` (or use `window.basecoat.theme.toggle()`)	✅ `basecoat.min.js` (part of `all.min.js`)	`data-side`, `data-size`, `data-tooltip`, `data-variant`	`<button class="btn" data-size="icon" data-tooltip="Toggle dark mode" onclick="window.basecoat.theme.toggle()">🌙</button>`
Toast	`toast`	✅ `toast.min.js`	`data-align`, `data-category`, `data-duration`, `data-toast-action`, `data-variant`	See docs / use `toast()`/`toaster()` macros.
Tooltip	any element	❌	`data-tooltip`, `data-side`, `data-align`, `data-size`	`<button class="btn" data-tooltip="Add to library">Hover</button>`

5. JavaScript components (interactive)

Only 13 of the 41 components need the Basecoat runtime. Load the full bundle (all.min.js) or the runtime + per-component script.

Component	Required JS (runtime + component)	Notes
Accordion	`basecoat.min.js` + `accordion.min.js`	Native `<details>` enhanced. `data-multiple` allows multiple open panels.
Combobox	`basecoat.min.js` + `combobox.min.js`	Searchable dropdown with `role="combobox"`.
Command	`basecoat.min.js` + `command.min.js`	Command palette / filterable menu.
Drawer	`basecoat.min.js` + `drawer.min.js`	Slides out from `data-side` (`left`/`right`/`top`/`bottom`).
Dropdown Menu	`basecoat.min.js` + `dropdown-menu.min.js`
Popover	`basecoat.min.js` + `popover.min.js`
Select	`basecoat.min.js` + `select.min.js`	Custom-styled, accessible dropdown.
Sidebar	`basecoat.min.js` + `sidebar.min.js`	Collapsible layout sidebar.
Slider	`basecoat.min.js` + `range.min.js`	Note: file is named `range.min.js`, not `slider.min.js`.
Tabs	`basecoat.min.js` + `tabs.min.js`
Theme Switcher	`basecoat.min.js` (in `all.min.js`)	Exposes `window.basecoat.theme.toggle()`.
Toast	`basecoat.min.js` + `toast.min.js`	Usually rendered server-side via HTMX or macro.
Chart	`basecoat.min.js` + `chart.min.js` + `chart.umd.min.js`	Not in `all.min.js`; Chart.js is a separate peer dependency.

Select example

<div class="select w-60" data-placeholder="Theme" id="theme">
 <button aria-controls="theme-listbox" aria-expanded="false" aria-haspopup="listbox" class="w-full" id="theme-trigger" type="button">
  <span class="truncate">
   Theme
  </span>
 </button>
 <div aria-hidden="true" data-popover="">
  <div aria-labelledby="theme-trigger" id="theme-listbox" role="listbox">
   <div data-value="light" role="option">
    Light
   </div>
   <div data-value="dark" role="option">
    Dark
   </div>
  </div>
 </div>
 <input name="theme" type="hidden" value=""/>
</div>

Dropdown Menu example

<div class="dropdown-menu" id="menu">
 <button aria-controls="menu-menu" aria-expanded="false" aria-haspopup="menu" class="btn" data-variant="outline" id="menu-trigger" type="button">
  Open
 </button>
 <div aria-hidden="true" data-align="end" data-popover="" id="menu-popover">
  <div aria-labelledby="menu-trigger" id="menu-menu" role="menu">
   <div role="group">
    <div role="heading">
     My Account
    </div>
    <div role="menuitem">
     <span>
      Profile
     </span>
     <kbd>
      ⇧⌘P
     </kbd>
    </div>
    <div role="menuitem">
     <span>
      Billing
     </span>
     <kbd>
      ⌘B
     </kbd>
    </div>
   </div>
   <hr role="separator"/>
   <div role="group">
    <div role="menuitem">
     Log out
    </div>
   </div>
  </div>
 </div>
</div>

Tabs example

<div class="tabs" id="tabs">
 <nav aria-orientation="horizontal" role="tablist">
  <button aria-controls="tabs-p1" aria-selected="true" id="tabs-1" role="tab" tabindex="0" type="button">
   Account
  </button>
  <button aria-controls="tabs-p2" aria-selected="false" id="tabs-2" role="tab" tabindex="-1" type="button">
   Password
  </button>
 </nav>
 <div aria-labelledby="tabs-1" aria-selected="true" id="tabs-p1" role="tabpanel" tabindex="-1">
  Account content
 </div>
 <div aria-labelledby="tabs-2" aria-selected="false" hidden="" id="tabs-p2" role="tabpanel" tabindex="-1">
  Password content
 </div>
</div>

Combobox example

<div class="combobox" id="combo">
 <input aria-autocomplete="list" aria-controls="combo-listbox" aria-expanded="false" autocomplete="off" placeholder="Select…" role="combobox" type="text"/>
 <div aria-hidden="true" data-popover="">
  <div data-empty="No items found." id="combo-listbox" role="listbox">
   <div data-value="a" role="option">
    A
   </div>
   <div data-value="b" role="option">
    B
   </div>
  </div>
 </div>
 <input name="combo" type="hidden" value=""/>
</div>

Command example

<div aria-label="Command menu" class="command border">
 <header>
  <input aria-autocomplete="list" aria-controls="cmd-menu" aria-expanded="true" autocomplete="off" placeholder="Type a command…" role="combobox" type="text"/>
 </header>
 <div data-empty="No results found." id="cmd-menu" role="menu">
  <div role="group">
   <span role="heading">
    Suggestions
   </span>
   <div data-filter="Calendar" data-keywords="date event" role="menuitem">
    Calendar
   </div>
  </div>
 </div>
</div>

Dialog / Drawer (native `<dialog>`)

Dialog, Alert Dialog, and Drawer do not need Basecoat JS. Use the native HTML <dialog> API:

<button class="btn" data-variant="outline" onclick="document.getElementById('dlg').showModal()">
 Open
</button>
<dialog class="dialog" id="dlg" onclick="if (event.target === this) this.close()">
 <div class="sm:max-w-sm">
  <header>
   <h2>
    Edit profile
   </h2>
  </header>
  <section>
   Make changes here.
  </section>
  <footer>
   <button class="btn" data-variant="outline" onclick="this.closest('dialog').close()">
    Cancel
   </button>
   <button class="btn" onclick="this.closest('dialog').close()">
    Save
   </button>
  </footer>
 </div>
</dialog>

For drawer, use <dialog class="drawer"> with an <article> child and data-side.

6. Jinja / Nunjucks macros

Macro	Arguments	Covers
`combobox()`	`id`, `selected`, `name`, `multiple`, `placeholder`, `close_on_select`, `clear`, `auto_highlight`, `format`, `main_attrs`, `input_attrs`, `popover_attrs`, `listbox_attrs`, `hidden_input_attrs`	Combobox
`command()`	`id`, `items`, `placeholder`, `empty_text`, `main_attrs`, `input_attrs`, `menu_attrs`	Command palette
`command_dialog()`	`id`, `items`, `placeholder`, `empty_text`, `dialog_attrs`, `input_attrs`, `menu_attrs`, `open`	Command palette in a dialog
`dialog()`	`id`, `trigger`, `title`, `description`, `footer`, `dialog_attrs`, `trigger_attrs`, `header_attrs`, `body_attrs`, `footer_attrs`, `open`, `close_button`, `close_on_overlay_click`	Dialog
`dropdown_menu()`	`trigger`, `id`, `items`, `main_attrs`, `trigger_attrs`, `popover_attrs`, `menu_attrs`	Dropdown Menu
`popover()`	`trigger`, `id`, `main_attrs`, `trigger_attrs`, `popover_attrs`	Popover
`select()`	`id`, `selected`, `name`, `items`, `multiple`, `placeholder`, `close_on_select`, `format`, `main_attrs`, `trigger_attrs`, `popover_attrs`, `listbox_attrs`, `input_attrs`	Select
`sidebar()`	`id`, `label`, `open`, `side`, `header`, `footer`, `menu`, `main_attrs`, `header_attrs`, `content_attrs`, `footer_attrs`	Sidebar
`tabs()`	`id`, `tabsets`, `main_attrs`, `tablist_attrs`, `default_tab_index`	Tabs
`toast()`	`category`, `title`, `description`, `duration`, `icon`, `action`, `cancel`, `attrs`	Individual toast
`toaster()`	`id`, `toasts`, `attrs`	Toast container

See site/src/docs/templates.mdx in the hunvreus/basecoat repo for full signatures and examples.

7. Themes / style packs

Basecoat separates component structure from visual style. You can use:

A full bundle: @import "basecoat-css"; (default Vega)
A named style pack: @import "basecoat-css/maia";
Base only + your own style: @import "basecoat-css/base.css"; then @import "./style-acme.css";
Base + one component + one style: @import "basecoat-css/components/button.css"; @import "basecoat-css/styles/vega.css";

Built-in style packs: vega, nova, maia, lyra, mira, luma, sera, rhea.

To create a custom theme, write CSS variables in the same structure as src/css/styles/<pack>.css in the Basecoat repo.

8. Gotchas

“Needs JS” means Basecoat JS. Many components are purely CSS (btn, card, input, table, alert, badge, tooltip). Do not import JS for them. The 13 JS components are listed in §5.
Native Select vs. custom Select. Both use the class select, but Native Select is <select class="select"> (no JS), while Select is <div class="select"> (requires JS).
Checkbox / Radio / Switch all use class="input". Do not invent class="checkbox". Style variants and state come from data-* attributes on the surrounding field or from the native element.
Dialog/Alert Dialog/Drawer use native <dialog>. Open them with .showModal() and close with .close(). No Basecoat JS runtime is required, though Drawer needs drawer.min.js for extra behavior.
Slider JS file is range.min.js. It is named after the range input, not the component.
Chart is not in all.min.js. It needs Chart.js (chart.umd.min.js) plus Basecoat's chart.min.js.
Spinner is not a component. It is a plain Lucide lucide-loader-circle icon with animate-spin. No Basecoat CSS file exists.
Scroll Area uses scrollbar, not scroll-area. Apply class="scrollbar" to the scrollable container.
Load Basecoat CSS after Tailwind. The docs explicitly say: load Basecoat after any stylesheet containing Tailwind base/preflight.
SVG icons are not provided. The docs use Lucide icons. Use <svg class="lucide lucide-icon-name"> or your own icon set.
No test suite. Use pre-commit/ruff for quality; do not write Django-style tests for the markup.

9. External links

Homepage: https://basecoatui.com/
GitHub: https://github.com/hunvreus/basecoat
npm: https://www.npmjs.com/package/basecoat-css
Intro: https://basecoatui.com/introduction/
Install: https://basecoatui.com/installation/
Components index: https://basecoatui.com/components/

basecoat

BasecoatUI

1. Install

npm + Tailwind v4

CDN (plain HTML / quick prototype)

2. Render a quick preview

3. Anatomy of a Basecoat component

4. Component catalog (41 components)

5. JavaScript components (interactive)

Select example

Dropdown Menu example

Tabs example

Combobox example

Command example

Dialog / Drawer (native <dialog>)

6. Jinja / Nunjucks macros

7. Themes / style packs

8. Gotchas

9. External links

BasecoatUI

1. Install

npm + Tailwind v4

CDN (plain HTML / quick prototype)

2. Render a quick preview

3. Anatomy of a Basecoat component

4. Component catalog (41 components)

5. JavaScript components (interactive)

Select example

Dropdown Menu example

Tabs example

Combobox example

Command example

Dialog / Drawer (native <dialog>)

6. Jinja / Nunjucks macros

7. Themes / style packs

8. Gotchas

9. External links

Dialog / Drawer (native `<dialog>`)

Dialog / Drawer (native `<dialog>`)