# Counter

> A figure that rolls into place like an odometer when it comes into view: digits on the right spin more and land last, a zero takes a full turn. Readable without the script.

Data display · counter, number, odometer, stats · HTML, CSS, vanilla JS · no dependencies · updated 2026-10-16
Demo: https://kodza.dev/components/counter-animation/

## Files

The code below, served as files: byte for byte what the Kodza site copies (the CSS includes its theme guard).

- [`kodza-counter-animation.css`](https://kodza.dev/registry/counter-animation/kodza-counter-animation.css) · 4.1 KB
- [`kodza-counter-animation.js`](https://kodza.dev/registry/counter-animation/kodza-counter-animation.js) · 4.4 KB
- [`kodza-counter-animation.html`](https://kodza.dev/registry/counter-animation/kodza-counter-animation.html) · 0.4 KB · the markup, to adapt and paste into your page

**Can you run shell commands? Download the CSS and the JS, don't retype them.** Retyping costs thousands of tokens and can drop or change lines of the CSS. Put the files where your stack expects them (Use it says where: change the `-o` paths):

```bash
curl -fsSL --create-dirs -o kodza/kodza-counter-animation.css https://kodza.dev/registry/counter-animation/kodza-counter-animation.css
curl -fsSL --create-dirs -o kodza/kodza-counter-animation.js https://kodza.dev/registry/counter-animation/kodza-counter-animation.js
```

Then load the files from your page as Use it shows, instead of pasting the content. The HTML is the part you adapt (text, links, modifiers): paste it from the Code section. Copy the CSS and the JS from the Code section only if you can't run commands, exactly as they are. (Windows PowerShell: `curl.exe`.)

## API

- Root: `.kodza-counter`
- Variables (set them on the root element itself: it declares its own defaults):
  - `--kz-counter-fg: #0a0a0a`
  - `--kz-counter-muted: rgba(10, 10, 10, 0.62)`
  - `--kz-counter-size: clamp(44px, 6vw, 72px)`
- Lifecycle: `kodza:init` / `kodza:destroy` on `document`, with `{ detail: { root } }` to target a container.

## Dark mode

The values Kodza uses on a dark background (`#0a0a0a`). For a page that follows the system theme, add them after the component's CSS:

```css
@media (prefers-color-scheme: dark) {
  .kodza-counter {
    --kz-counter-fg: #f2f2f0;
    --kz-counter-muted: rgba(242, 242, 240, 0.62);
  }
}
```

A site with its own theme switch puts the same rules under its dark selector instead (`[data-theme="dark"] .kodza-counter { … }`); a single dark section, under that section's class.

## Use it

### Plain HTML page

- CSS: `kodza/kodza-counter-animation.css` next to the page (the Files commands as they are), linked in `<head>`: `<link rel="stylesheet" href="kodza/kodza-counter-animation.css">`. Without a shell, paste it in a `<style>` in `<head>` instead. It only touches `kodza-` classes.
- HTML: where the component goes. Paste it as many times as you need: instances never interfere.
- JS: `kodza/kodza-counter-animation.js`, loaded with `<script src="kodza/kodza-counter-animation.js" defer></script>` in `<head>`. Without a shell, paste it in a `<script>` before `</body>` (or in `<head>`: it waits for the page). One copy per page, whatever the number of instances.
- Restyle with the `--kz-…` variables, set on the component's root element itself (the root declares its own defaults, so a value on an ancestor is ignored), and with the modifiers / attributes listed under API.
- Font: it takes the page's own. The Kodza look is Geist: `<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&family=Geist+Mono:wght@400;500&display=swap">`.
- Content added later (AJAX navigation, a SPA route, a builder preview): start it with `document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root: container } }))`; before removing it, the same call with `'kodza:destroy'` stops it and puts the original markup back.

### Claude artifact (claude.ai)

- Paste the CSS in a `<style>` and the JS in a `<script>` at the end, in the artifact itself: it loads stylesheets only from Google Fonts and scripts only from a few CDNs, so no `<link>` or `<script src>` to Kodza.
- Writing the artifact file with a shell? Insert the downloaded files (Files) with a command instead of retyping them: a line `KODZA-CSS` alone inside the `<style>`, `KODZA-JS` inside the `<script>`, then `sed -e '/^KODZA-CSS$/{r kodza/kodza-counter-animation.css' -e 'd' -e '}' -e '/^KODZA-JS$/{r kodza/kodza-counter-animation.js' -e 'd' -e '}' page.html > artifact.html`.
- Font: load Geist from Google Fonts (allowed): `<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&family=Geist+Mono:wght@400;500&display=swap">`.
- Dark mode: the viewer sets `data-theme="dark"` or `"light"` on `<html>`, or nothing when it follows the system. Write the Dark mode rules twice: inside `@media (prefers-color-scheme: dark)` with `:root:not([data-theme="light"])` in front of each selector, and with `:root[data-theme="dark"]` in front of each selector.

### WordPress

- HTML: a **Custom HTML** block (or a pattern / template part). WordPress keeps this markup as it is only for users allowed to post unfiltered HTML (Administrators; Super Admins on multisite): for anyone else it strips tags such as `<svg>`, `<input>` or `<dialog>`, so add it from the theme (a pattern or template part) instead.
- CSS and JS: the downloaded files go in the theme, under `wp-content/themes/<your-theme>/kodza/` (the child theme if there is one), enqueued from its functions.php (or a code-snippets plugin):
  ```php
  add_action('wp_enqueue_scripts', function () {
    $dir = get_stylesheet_directory() . '/kodza/';
    $uri = get_stylesheet_directory_uri() . '/kodza/';
    wp_enqueue_style('kodza-counter-animation', $uri . 'kodza-counter-animation.css', [], filemtime($dir . 'kodza-counter-animation.css'));
    wp_enqueue_script('kodza-counter-animation', $uri . 'kodza-counter-animation.js', [], filemtime($dir . 'kodza-counter-animation.js'), true);
  });
  ```
  Scoped to `kodza-` classes, the CSS never touches the theme. One copy of the JS, whatever the number of blocks.
- No access to the theme files? The CSS can also go, as it is, in **Appearance → Customize → Additional CSS** (classic theme) or **Styles → Additional CSS** in the Site Editor (block theme).
- Theme with AJAX page transitions: fire `kodza:init` on the new content after each swap (and `kodza:destroy` on the old one).
- Performance plugin (WP Rocket, LiteSpeed Cache, Perfmatters…) with **Delay JavaScript execution** turned on: add `kodza` to the scripts it must not delay. Otherwise the component waits for the visitor's first scroll, tap or mouse move, and that first click can be lost.
- Colours: by default, match the theme's palette. After the component's CSS, point these variables at the theme's colours, on the component root, Kodza's value as the fallback:
  `.kodza-counter { --kz-counter-fg: var(TEXT, #0a0a0a); }`
  TEXT, BACKGROUND and ACCENT (the colour the theme fills its own buttons with) are the theme's own colour variables — block themes (theme.json, like Twenty Twenty-Five): `--wp--preset--color--contrast`, `--wp--preset--color--base`, `--wp--preset--color--contrast` (they fill their buttons with it; their accent-1… colours are decorative); Astra: `--ast-global-color-2`, `--ast-global-color-4`, `--ast-global-color-0`; Kadence: `--global-palette3`, `--global-palette9`, `--global-palette1`; GeneratePress: `--contrast`, `--base-3`, `--accent`; Blocksy: `--theme-palette-color-4`, `--theme-palette-color-8`, `--theme-palette-color-1`. Use only these names, and only if the site really has them (the theme's CSS, or Styles → Colors): the `--wp--preset--color--black`, `--white`, `--vivid-…` that WordPress adds everywhere are not the theme's palette. Another theme, or one without these variables (Hello Elementor, OceanWP): leave the variables alone, it keeps Kodza's monochrome; same when the developer asks for monochrome or the Kodza look. Leave the translucent greys (`rgba(10, 10, 10, …)`) as they are: they suit any light background. On a dark palette, set the other variables from Dark mode too.
- WordPress turns straight quotes and `--` into typographic ones in the text of a Custom HTML block (not inside `<code>` or `<pre>`).

#### With Elementor

- HTML: an **HTML** widget (Elementor shows it to administrators only). It keeps the code exactly as pasted, straight quotes included.
- CSS and JS: as above. Elementor's Site Settings → Theme Style styles every button, field, link and image of the page, components included; the theme guard at the end of the CSS keeps the component's buttons, fields and link colours as they are.
- The Elementor editor redraws each widget after the page has loaded: without the script below, the component stays still in the editor preview (the published page works). Add it once per site, in the footer like the component's script (`kodza/elementor-editor.js`, or a code-snippets plugin):

```js
// Kodza in the Elementor editor: the editor redraws each HTML widget after the page has loaded.
// Start Kodza in what it draws, stop it in what it replaces or removes. Once per site.
window.addEventListener('elementor/frontend/init', () => {
  if (!elementorFrontend.isEditMode()) return;
  class KodzaWidget extends elementorModules.frontend.handlers.Base {
    onInit() {
      super.onInit();
      this.kodza = [...this.$element[0].children];
      document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root: this.$element[0] } }));
    }
    onDestroy() {
      super.onDestroy();
      this.kodza.forEach((root) => document.dispatchEvent(new CustomEvent('kodza:destroy', { detail: { root } })));
    }
  }
  elementorFrontend.elementsHandler.attachHandler('html', KodzaWidget);
});
```

- No child theme: everything can go in the HTML widget instead, `<style>` with the CSS, the HTML, then `<script>` with the JS. It works on the page and in the editor without the script above.

### Shopify

- Files: `assets/kodza-counter-animation.css` and `assets/kodza-counter-animation.js` (the Files commands with `-o assets/…`).
- In the section: `{{ 'kodza-counter-animation.css' | asset_url | stylesheet_tag }}` and `<script src="{{ 'kodza-counter-animation.js' | asset_url }}" defer></script>`, then the HTML.
- The theme editor re-renders sections: restart them with
  `document.addEventListener('shopify:section:load', (e) => document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root: e.target } })));`
  and the same with `shopify:section:unload` → `kodza:destroy`.

### React / Next.js

- Files, side by side (e.g. in `components/kodza/`): `Counter.tsx` (below), the CSS block under Code saved as `counter-animation.css` and the JS block as `counter-animation.js`, both as they are. The HTML block is already inside the component: skip it.
- Use it: `import { Counter } from '@/components/kodza/Counter';` then `<Counter />`. Props: `vars` (the `--kz-…` variables listed under API, e.g. `vars={{ '--kz-counter-fg': … }}`), `className`, `style` and the other props of its `<div>` (`onClick`, `aria-…`).
- Next.js App Router: it is a Client Component already (`'use client'`). Pages Router: Next.js takes global CSS only in `pages/_app`, so move the `import './counter-animation.css'` line there.
- Safe under StrictMode, client-side navigation and prop changes: when a prop changes, the `key` gives React a fresh element, `kodza:destroy` stops the script on the old one and `kodza:init` starts it on the new one.

```tsx
'use client';
// Kodza — Counter, for React. From https://kodza.dev/components/counter-animation/
// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Next to this file: counter-animation.css and counter-animation.js, the component's CSS and JS from Kodza, as they are.
// Yours to edit: the markup is plain JSX below.
// The script changes this markup once React has rendered it (it adds layers, splits text, moves
// nodes), so React must not patch it afterwards. When a prop changes, the key gives React a fresh
// element: kodza:destroy stops the script on the old one, kodza:init starts it on the new one.
import { useRef, useEffect, type ComponentPropsWithoutRef, type ComponentRef, type CSSProperties } from 'react';
import './counter-animation.css';

export type CounterProps = Omit<ComponentPropsWithoutRef<'div'>, "children" | "vars"> & {
  /** Settings, as CSS variables on the root */
  vars?: {
    /** default: #0a0a0a */
    "--kz-counter-fg"?: string | number;
    /** default: rgba(10, 10, 10, 0.62) */
    "--kz-counter-muted"?: string | number;
    /** default: clamp(44px, 6vw, 72px) */
    "--kz-counter-size"?: string | number;
  };
  className?: string;
};

export function Counter({ vars, className, style, ...rest }: CounterProps) {
  const ref = useRef<ComponentRef<'div'>>(null);
  const classes = ["kodza-counter", className].filter(Boolean).join(' ');
  // Everything the markup is made of: when it changes, React gets a fresh element (see the top)
  const key = JSON.stringify([classes, vars, style, rest]);

  // Starts the script on this element once React has rendered it, stops it when it goes
  useEffect(() => {
    const root = ref.current;
    let live = true;
    // @ts-ignore: a plain script, no types to find
    import('./counter-animation.js').then(() => {
      if (live) document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root } }));
    });
    return () => {
      live = false;
      document.dispatchEvent(new CustomEvent('kodza:destroy', { detail: { root } }));
    };
  }, [key]);

  return (
    <div key={key} {...rest} className={classes} style={{ ...vars, ...style } as CSSProperties} ref={ref}>
      <p className="kodza-counter__value">12,480</p>
      <p className="kodza-counter__label">components copied this month</p>
    </div>
  );
}
```

## Code

```html
<div class="kodza-counter">
  <p class="kodza-counter__value">12,480</p>
  <p class="kodza-counter__label">components copied this month</p>
</div>

<div class="kodza-counter">
  <p class="kodza-counter__value">99.9%</p>
  <p class="kodza-counter__label">uptime, on a good day</p>
</div>

<div class="kodza-counter">
  <p class="kodza-counter__value">0</p>
  <p class="kodza-counter__label">dependencies. Still.</p>
</div>
```

```css
/* Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license */
/* Kodza — Counter
   A figure that rolls into place like an odometer when it comes into view: every digit spins
   from 0, the ones on the right spin more and land last; a zero takes one full turn for the
   fun of it. Write the final figure in the HTML (it stays readable without the script, and
   for search engines); separators, decimals and signs stay put.
   Everything is tuned with the --kz-counter-* variables. */
.kodza-counter {
  --kz-counter-fg: #0a0a0a;
  --kz-counter-muted: rgba(10, 10, 10, 0.62);
  --kz-counter-size: clamp(44px, 6vw, 72px);

  display: grid;
  gap: 8px;
  color: var(--kz-counter-fg);
}

.kodza-counter__value {
  display: flex;
  margin: 0;
  font-size: var(--kz-counter-size);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  letter-spacing: -0.045em;
}

/* Each digit spins in its own window */
.kodza-counter__digit {
  display: inline-block;
  height: 1.1em;
  overflow: hidden;
}

.kodza-counter__digit > span {
  display: block;
}

.kodza-counter__digit > span > span {
  display: block;
  height: 1.1em;
}

.kodza-counter__char {
  white-space: pre;
}

.kodza-counter__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.kodza-counter__label {
  margin: 0;
  color: var(--kz-counter-muted);
  font-size: 15px;
  line-height: 1.5;
}

/* Theming example — on a dark background:
.dark-section .kodza-counter {
  --kz-counter-fg: #f2f2f0;
  --kz-counter-muted: rgba(242, 242, 240, 0.62);
}
*/

/* kodza-guard 894660ff6016 — generated by Kodza, do not edit.
   Theme guard: keeps a site's own CSS (WordPress themes, Bootstrap, CSS resets…) off this
   component. :not(#_) is always true and weighs as much as an id, so these lines win over
   theme rules made of classes and tags. Customise the component through its --kz-* variables. */

/* What the browser gives, on everything the component leaves to it */

.kodza-counter:not(#_),
.kodza-counter__digit:not(#_),
.kodza-counter__char:not(#_),
.kodza-counter__sr:not(#_),
.kodza-counter__digit span:where(:not([class*="kodza-"])):not(#_) {
  box-sizing: revert;
}

.kodza-counter__value:not(#_) {
  border: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-style: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-counter__label:not(#_) {
  border: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  font-family: revert;
  font-weight: revert;
  font-style: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-counter__label:not(#_):where(:not([hidden])) {
  display: revert;
}

.kodza-counter__label:not(#_):where([hidden]) {
  display: none;
}

/* The component's own rules, one step stronger: real buttons and fields, what it sets on tags themes style (links, lists, headings, images…), and the root width (a theme may narrow it, never widen it) */

.kodza-counter__value:not(#_) {
  display: flex;
  margin: 0;
  font-size: var(--kz-counter-size);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.045em;
}

.kodza-counter__label:not(#_) {
  margin: 0;
  color: var(--kz-counter-muted);
  font-size: 15px;
  line-height: 1.5;
}
```

```js
// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Kodza — Counter
// Turns the figure into windows of spinning digits (screen readers keep the plain text), then
// rolls them when the counter comes into view: more turns and a later landing for the digits
// on the right. "kodza:replay" on the element rolls it again.
(() => {
  const SELECTOR = '.kodza-counter';
  const reduceMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  // One instance. Everything it starts is tied to `signal`, so kodza:destroy stops it all
  function mount(root, signal) {
    const value = root.querySelector('.kodza-counter__value');
    if (!value) return;
    const text = value.textContent.trim();
    const count = (text.match(/\d/g) || []).length;
    let rank = 0;
    const strips = [];

    value.setAttribute('aria-hidden', 'true');
    value.after(Object.assign(document.createElement('span'), { className: 'kodza-counter__sr', textContent: text }));
    value.replaceChildren(...[...text].map((char) => {
      if (!/\d/.test(char)) return Object.assign(document.createElement('span'), { className: 'kodza-counter__char', textContent: char });
      // The digits on the right spin more: one turn on the left, up to three on the right
      const turns = 1 + Math.round((rank / Math.max(1, count - 1)) * 2);
      const column = Object.assign(document.createElement('span'), { className: 'kodza-counter__digit' });
      const strip = document.createElement('span');
      for (let i = 0; i < (turns + 1) * 10; i++) strip.append(Object.assign(document.createElement('span'), { textContent: i % 10 }));
      column.append(strip);
      strips.push({ strip, stop: turns * 10 + Number(char), rank: rank++ });
      return column;
    }));

    const land = () => strips.forEach(({ strip, stop }) => (strip.style.transform = `translateY(${-stop * 1.1}em)`));
    const roll = () => {
      if (reduceMotion) return land();
      strips.forEach(({ strip, stop, rank: r }) => {
        strip.getAnimations().forEach((animation) => animation.cancel());
        strip.style.transform = '';
        strip.animate([{ transform: 'translateY(0)' }, { transform: `translateY(${-stop * 1.1}em)` }], {
          duration: 1500 + r * 160,
          easing: 'cubic-bezier(0.16, 1, 0.3, 1)',
          fill: 'forwards',
        });
      });
    };

    if (reduceMotion || !('IntersectionObserver' in window)) land();
    else {
      const io = new IntersectionObserver((entries) => {
        if (!entries.some((entry) => entry.isIntersecting)) return;
        io.disconnect();
        roll();
      }, { threshold: 0.6 });
      io.observe(root);
      signal.addEventListener('abort', () => io.disconnect());
    }
    root.addEventListener('kodza:replay', roll, { signal });
  }

  // Kodza lifecycle, the same in every component: `kodza:init` starts the instances inside
  // event.detail.root (the whole page by default), `kodza:destroy` stops them and puts their
  // markup back. For themes and apps that swap content without a page load.
  const instances = new WeakMap();
  const find = (scope = document) => [scope, ...scope.querySelectorAll(SELECTOR)].filter((el) => el.matches?.(SELECTOR));
  const init = (scope) => find(scope).forEach((root) => {
    if (root.classList.contains('is-ready')) return; // already running, maybe from another copy of this script
    const controller = new AbortController();
    instances.set(root, { controller, html: root.innerHTML, attrs: [...root.attributes].map((a) => [a.name, a.value]) });
    mount(root, controller.signal);
    root.classList.add('is-ready');
  });
  const destroy = (scope) => find(scope).forEach((root) => {
    const instance = instances.get(root);
    if (!instance) return;
    instances.delete(root);
    instance.controller.abort();
    [...root.attributes].forEach((a) => root.removeAttribute(a.name));
    instance.attrs.forEach(([name, value]) => root.setAttribute(name, value));
    root.innerHTML = instance.html;
  });
  document.addEventListener('kodza:init', (event) => init(event.detail?.root));
  document.addEventListener('kodza:destroy', (event) => destroy(event.detail?.root));
  init();
  // Loaded in <head>, the script runs before the markup exists: once more when it is parsed
  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', () => init(), { once: true });
})();
```

Free to use, from Kodza (https://kodza.dev).