# Countdown

> A live countdown to a date: every digit that changes falls out of its window as the next one drops in, and at zero the figures step aside for your message. Large or inline.

Data display · countdown, timer, date, launch · HTML, CSS, vanilla JS · no dependencies · updated 2026-10-16
Demo: https://kodza.dev/components/event-day-counter/

## Files

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

- [`kodza-event-day-counter.css`](https://kodza.dev/registry/event-day-counter/kodza-event-day-counter.css) · 6.8 KB
- [`kodza-event-day-counter.js`](https://kodza.dev/registry/event-day-counter/kodza-event-day-counter.js) · 5.6 KB
- [`kodza-event-day-counter.html`](https://kodza.dev/registry/event-day-counter/kodza-event-day-counter.html) · 1.5 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-event-day-counter.css https://kodza.dev/registry/event-day-counter/kodza-event-day-counter.css
curl -fsSL --create-dirs -o kodza/kodza-event-day-counter.js https://kodza.dev/registry/event-day-counter/kodza-event-day-counter.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-countdown`
- Variables (set them on the root element itself: it declares its own defaults):
  - `--kz-countdown-fg: #0a0a0a`
  - `--kz-countdown-muted: rgba(10, 10, 10, 0.62)`
  - `--kz-countdown-soft: rgba(10, 10, 10, 0.07)`
  - `--kz-countdown-chip: #ffffff`
  - `--kz-countdown-size: clamp(44px, 7vw, 84px)`
  - `--kz-countdown-ease: cubic-bezier(0.22, 1, 0.36, 1)`
- Modifiers: `.kodza-countdown--inline`
- Attributes:
  - `data-date` (e.g. `2027-01-01T00:00:00`)
  - `data-done` (e.g. `Happy new year. Ship something.`, `Early bird is gone.`)
  - `data-unit` (e.g. `days`, `hours`, `minutes`, `seconds`)
- 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-countdown {
    --kz-countdown-fg: #f2f2f0;
    --kz-countdown-muted: rgba(242, 242, 240, 0.62);
    --kz-countdown-soft: rgba(255, 255, 255, 0.08);
    --kz-countdown-chip: #1c1c1c;
  }
}
```

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

## Use it

### Plain HTML page

- CSS: `kodza/kodza-event-day-counter.css` next to the page (the Files commands as they are), linked in `<head>`: `<link rel="stylesheet" href="kodza/kodza-event-day-counter.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-event-day-counter.js`, loaded with `<script src="kodza/kodza-event-day-counter.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$/{r kodza/kodza-event-day-counter.css' -e 'd' -e '}' -e '/^KODZA-JS$/{r kodza/kodza-event-day-counter.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.
- This one is inline (it flows like a word): pasted alone, many themes leave it at the edge of the page (block themes, and classic ones like Twenty Twenty-One or Blocksy), so put the Custom HTML block inside a **Group** block to line it up with the text.
- 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-event-day-counter', $uri . 'kodza-event-day-counter.css', [], filemtime($dir . 'kodza-event-day-counter.css'));
    wp_enqueue_script('kodza-event-day-counter', $uri . 'kodza-event-day-counter.js', [], filemtime($dir . 'kodza-event-day-counter.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-countdown { --kz-countdown-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-event-day-counter.css` and `assets/kodza-event-day-counter.js` (the Files commands with `-o assets/…`).
- In the section: `{{ 'kodza-event-day-counter.css' | asset_url | stylesheet_tag }}` and `<script src="{{ 'kodza-event-day-counter.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/`): `Countdown.tsx` (below), the CSS block under Code saved as `event-day-counter.css` and the JS block as `event-day-counter.js`, both as they are. The HTML block is already inside the component: skip it.
- Use it: `import { Countdown } from '@/components/kodza/Countdown';` then `<Countdown />`. Props: `variant` ("inline", or several in an array), `date` (`data-date`: "2027-01-01T00:00:00"), `done` (`data-done`: "Happy new year. Ship something.", "Early bird is gone."), `vars` (the `--kz-…` variables listed under API, e.g. `vars={{ '--kz-countdown-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 './event-day-counter.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 — Countdown, for React. From https://kodza.dev/components/event-day-counter/
// 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: event-day-counter.css and event-day-counter.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 './event-day-counter.css';

type Variant = "inline";

export type CountdownProps = Omit<ComponentPropsWithoutRef<'div'>, "children" | "variant" | "vars" | "date" | "done"> & {
  /** Modifier class(es): .kodza-countdown--inline */
  variant?: Variant | Variant[];
  /** data-date on the root (default: 2027-01-01T00:00:00) */
  date?: "2027-01-01T00:00:00";
  /** data-done on the root (default: Happy new year. Ship something.) */
  done?: "Happy new year. Ship something." | "Early bird is gone.";
  /** Settings, as CSS variables on the root */
  vars?: {
    /** default: #0a0a0a */
    "--kz-countdown-fg"?: string | number;
    /** default: rgba(10, 10, 10, 0.62) */
    "--kz-countdown-muted"?: string | number;
    /** default: rgba(10, 10, 10, 0.07) */
    "--kz-countdown-soft"?: string | number;
    /** default: #ffffff */
    "--kz-countdown-chip"?: string | number;
    /** default: clamp(44px, 7vw, 84px) */
    "--kz-countdown-size"?: string | number;
    /** default: cubic-bezier(0.22, 1, 0.36, 1) */
    "--kz-countdown-ease"?: string | number;
  };
  className?: string;
};

export function Countdown({ variant, date = "2027-01-01T00:00:00", done = "Happy new year. Ship something.", vars, className, style, ...rest }: CountdownProps) {
  const ref = useRef<ComponentRef<'div'>>(null);
  const classes = ["kodza-countdown", ...([] as string[]).concat(variant ?? []).map((v) => `kodza-countdown--${v}`), 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, date, done, 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('./event-day-counter.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 role="timer" key={key} {...rest} className={classes} data-date={date} data-done={done} style={{ ...vars, ...style } as CSSProperties} ref={ref}>
      <div className="kodza-countdown__units">
        <span className="kodza-countdown__unit">
          <span className="kodza-countdown__value" data-unit="days">00</span>
          <span className="kodza-countdown__label">Days</span>
        </span>
        {' '}
        <span className="kodza-countdown__sep" aria-hidden="true">:</span>
        {' '}
        <span className="kodza-countdown__unit">
          <span className="kodza-countdown__value" data-unit="hours">00</span>
          <span className="kodza-countdown__label">Hours</span>
        </span>
        {' '}
        <span className="kodza-countdown__sep" aria-hidden="true">:</span>
        {' '}
        <span className="kodza-countdown__unit">
          <span className="kodza-countdown__value" data-unit="minutes">00</span>
          <span className="kodza-countdown__label">Minutes</span>
        </span>
        {' '}
        <span className="kodza-countdown__sep" aria-hidden="true">:</span>
        {' '}
        <span className="kodza-countdown__unit">
          <span className="kodza-countdown__value" data-unit="seconds">00</span>
          <span className="kodza-countdown__label">Seconds</span>
        </span>
      </div>
    </div>
  );
}
```

## Code

```html
<div class="kodza-countdown" role="timer" data-date="2027-01-01T00:00:00" data-done="Happy new year. Ship something.">
  <div class="kodza-countdown__units">
    <span class="kodza-countdown__unit"><span class="kodza-countdown__value" data-unit="days">00</span><span class="kodza-countdown__label">Days</span></span>
    <span class="kodza-countdown__sep" aria-hidden="true">:</span>
    <span class="kodza-countdown__unit"><span class="kodza-countdown__value" data-unit="hours">00</span><span class="kodza-countdown__label">Hours</span></span>
    <span class="kodza-countdown__sep" aria-hidden="true">:</span>
    <span class="kodza-countdown__unit"><span class="kodza-countdown__value" data-unit="minutes">00</span><span class="kodza-countdown__label">Minutes</span></span>
    <span class="kodza-countdown__sep" aria-hidden="true">:</span>
    <span class="kodza-countdown__unit"><span class="kodza-countdown__value" data-unit="seconds">00</span><span class="kodza-countdown__label">Seconds</span></span>
  </div>
</div>

<p class="kodza-countdown kodza-countdown--inline" role="timer" data-date="2027-01-01T00:00:00" data-done="Early bird is gone.">
  <span class="kodza-countdown__units">Early bird ends in <span class="kodza-countdown__clock"><span class="kodza-countdown__value" data-unit="hours">00</span><span class="kodza-countdown__colon">:</span><span class="kodza-countdown__value" data-unit="minutes">00</span><span class="kodza-countdown__colon">:</span><span class="kodza-countdown__value" data-unit="seconds">00</span></span></span>
</p>
```

```css
/* Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license */
/* Kodza — Countdown
   A live countdown to data-date. Counting down, every digit that changes falls: the old one
   drops out of its window as the new one comes from above. At zero the figures step aside
   for data-done. Large (days, hours, minutes, seconds) or --inline, in a sentence. Without
   days, the hours add them up. Screen readers get a sentence, refreshed every minute.
   Everything is tuned with the --kz-countdown-* variables. */
.kodza-countdown {
  --kz-countdown-fg: #0a0a0a;
  --kz-countdown-muted: rgba(10, 10, 10, 0.62);
  --kz-countdown-soft: rgba(10, 10, 10, 0.07);
  --kz-countdown-chip: #ffffff;
  --kz-countdown-size: clamp(44px, 7vw, 84px);
  --kz-countdown-ease: cubic-bezier(0.22, 1, 0.36, 1);

  display: inline-grid;
  margin: 0;
  color: var(--kz-countdown-fg);
}

.kodza-countdown__units,
.kodza-countdown__done {
  grid-area: 1 / 1;
  transition: transform 0.7s var(--kz-countdown-ease), opacity 0.4s ease, visibility 0s;
}

.kodza-countdown__units {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.kodza-countdown__unit {
  display: grid;
  justify-items: center;
  gap: 10px;
}

.kodza-countdown__value {
  display: inline-flex;
  font-size: var(--kz-countdown-size);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  letter-spacing: -0.05em;
}

/* Each digit in its own window, where it falls */
.kodza-countdown__digit {
  display: inline-grid;
  overflow: hidden;
  padding-block: 0.06em;
  margin-block: -0.06em;
}

.kodza-countdown__digit > span {
  grid-area: 1 / 1;
}

.kodza-countdown__label {
  color: var(--kz-countdown-muted);
  font-family: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.kodza-countdown__sep {
  color: var(--kz-countdown-muted);
  font-size: calc(var(--kz-countdown-size) * 0.7);
  font-weight: 300;
  line-height: 1.2;
}

/* At zero: the figures step aside, the message rises */
.kodza-countdown__done {
  align-self: center;
  font-size: calc(var(--kz-countdown-size) * 0.42);
  font-weight: 600;
  letter-spacing: -0.03em;
  opacity: 0;
  transform: translateY(40%);
  visibility: hidden;
  transition: transform 0.6s var(--kz-countdown-ease), opacity 0.35s ease, visibility 0s linear 0.6s;
}

/* What leaves stays visible until it has left */
.kodza-countdown.is-done .kodza-countdown__units {
  opacity: 0;
  transform: translateY(-30%);
  visibility: hidden;
  transition: transform 0.7s var(--kz-countdown-ease), opacity 0.4s ease, visibility 0s linear 0.7s;
}

.kodza-countdown.is-done .kodza-countdown__done {
  opacity: 1;
  transform: none;
  visibility: visible;
  transition: transform 0.8s var(--kz-countdown-ease) 0.15s, opacity 0.5s ease 0.15s, visibility 0s;
}

/* Inline: a chip, the words then the time in a small mono pill, all centred on one line */
.kodza-countdown--inline {
  --kz-countdown-size: 13px;

  padding: 5px 5px 5px 16px;
  border-radius: 999px;
  background: var(--kz-countdown-soft);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
}

.kodza-countdown--inline .kodza-countdown__units {
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}

.kodza-countdown__clock {
  display: inline-flex;
  align-items: center;
  height: 28px;
  padding: 0 11px;
  border-radius: 999px;
  background: var(--kz-countdown-chip, #ffffff);
  box-shadow: inset 0 0 0 1px var(--kz-countdown-soft);
  font-family: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;
  font-variant-numeric: tabular-nums;
}

.kodza-countdown--inline .kodza-countdown__value {
  font-family: inherit;
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.2;
}

.kodza-countdown__colon {
  margin: 0 -1px;
  color: var(--kz-countdown-muted);
}

.kodza-countdown--inline .kodza-countdown__done {
  justify-self: center;
  padding-right: 11px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0;
}

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

@media (max-width: 560px) {
  .kodza-countdown__units {
    gap: 8px;
  }

  .kodza-countdown:not(.kodza-countdown--inline) {
    --kz-countdown-size: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .kodza-countdown__units,
  .kodza-countdown__done {
    transition-duration: 0.01ms !important;
  }
}

/* Theming example — on a dark background:
.dark-section .kodza-countdown {
  --kz-countdown-fg: #f2f2f0;
  --kz-countdown-muted: rgba(242, 242, 240, 0.62);
  --kz-countdown-soft: rgba(255, 255, 255, 0.08);
  --kz-countdown-chip: #1c1c1c;
}
*/

/* kodza-guard 6be0046f1761 — 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, where the component sets it only in some states: at the lowest weight, so its own rules below put it back */

:where(.kodza-countdown):not(#_) {
  padding: revert;
  border-radius: revert;
  background-color: revert;
  background-image: revert;
  font-size: revert;
  font-weight: revert;
  line-height: revert;
}

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

.kodza-countdown:not(#_) {
  border: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  position: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-height: revert;
  font-family: 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-countdown__units:not(#_),
.kodza-countdown__unit:not(#_),
.kodza-countdown__value:not(#_),
.kodza-countdown__digit:not(#_),
.kodza-countdown__label:not(#_),
.kodza-countdown__sep:not(#_),
.kodza-countdown__done:not(#_),
.kodza-countdown__sr:not(#_),
.kodza-countdown__clock:not(#_),
.kodza-countdown__colon:not(#_),
.kodza-countdown__digit span:where(:not([class*="kodza-"])):not(#_) {
  box-sizing: revert;
}

/* 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-countdown:where(p):not(#_) {
  display: inline-grid;
  color: var(--kz-countdown-fg);
}

.kodza-countdown--inline:not(#_) {
  padding: 5px 5px 5px 16px;
  border-radius: 999px;
  background: var(--kz-countdown-soft);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
}
```

```js
// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Kodza — Countdown
// Ticks on the second towards data-date, rolls down every digit that changes, and switches to
// data-done at zero. Change data-date and it follows. Screen readers get "3 days, 4 hours,
// 12 minutes left" (updated once a minute, not every second).
(() => {
  const SELECTOR = '.kodza-countdown';
  const reduceMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  const ease = 'cubic-bezier(0.22, 1, 0.36, 1)';
  const SPAN = { days: 86400, hours: 3600, minutes: 60, seconds: 1 };

  // One instance. Everything it starts is tied to `signal`, so kodza:destroy stops it all
  function mount(root, signal) {
    const values = [...root.querySelectorAll('.kodza-countdown__value')];
    const units = root.querySelector('.kodza-countdown__units');
    const hasDays = values.some((el) => el.dataset.unit === 'days');
    let timer = 0;
    let said = '';

    units.setAttribute('aria-hidden', 'true');
    const sr = Object.assign(document.createElement('span'), { className: 'kodza-countdown__sr' });
    const done = Object.assign(document.createElement('span'), { className: 'kodza-countdown__done', textContent: root.dataset.done || '' });
    root.append(done, sr);

    // A value is a row of digit windows; a digit that changes drops out, the new one comes from above
    const show = (el, text, animate) => {
      const cells = [...el.children];
      if (cells.length !== text.length) {
        el.replaceChildren(...[...text].map((char) => {
          const cell = Object.assign(document.createElement('span'), { className: 'kodza-countdown__digit' });
          cell.append(Object.assign(document.createElement('span'), { textContent: char }));
          return cell;
        }));
        return;
      }
      [...text].forEach((char, i) => {
        const cell = cells[i];
        const old = cell.lastElementChild;
        if (old.textContent === char) return;
        const next = Object.assign(document.createElement('span'), { textContent: char });
        cell.append(next);
        if (!animate || reduceMotion) return old.remove();
        const timing = { duration: 520, easing: ease };
        old.animate([{ transform: 'none', opacity: 1 }, { transform: 'translateY(100%)', opacity: 0 }], { ...timing, fill: 'forwards' }).finished.then(() => old.remove());
        next.animate([{ transform: 'translateY(-100%)', opacity: 0 }, { transform: 'none', opacity: 1 }], timing);
      });
    };

    const tick = (animate = true) => {
      clearTimeout(timer);
      const target = new Date(root.dataset.date).getTime();
      if (Number.isNaN(target)) return;
      let left = Math.max(0, Math.round((target - Date.now()) / 1000));
      const over = left === 0;
      if (!over) root.classList.remove('is-done');
      const parts = {};
      ['days', 'hours', 'minutes', 'seconds'].forEach((unit) => {
        if (unit === 'days' && !hasDays) return;
        parts[unit] = Math.floor(left / SPAN[unit]);
        left -= parts[unit] * SPAN[unit];
      });
      values.forEach((el) => show(el, String(parts[el.dataset.unit] ?? 0).padStart(2, '0'), animate));
      const sentence = over
        ? root.dataset.done || 'Time is up'
        : `${hasDays ? `${parts.days} days, ` : ''}${parts.hours} hours, ${parts.minutes} minutes left`;
      if (sentence !== said) sr.textContent = said = sentence;
      // At zero, 00 lands first, then the message takes over
      if (over) {
        if (root.dataset.done && !root.classList.contains('is-done')) timer = setTimeout(() => root.classList.add('is-done'), animate && !reduceMotion ? 900 : 0);
        return;
      }
      timer = setTimeout(tick, 1000 - (Date.now() % 1000) + 10);
    };

    tick(false);
    const observer = new MutationObserver(() => tick());
    observer.observe(root, { attributes: true, attributeFilter: ['data-date'] });
    signal.addEventListener('abort', () => {
      observer.disconnect();
      clearTimeout(timer);
    });
  }

  // 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).