# Signature Pad

> A box to sign with a finger, a mouse or a stylus: the ink thins as the pen speeds up, Undo backs the last stroke out along its path, and a typed name signs too. The form gets a trimmed PNG.

Forms · signature, canvas, draw, sign, form, touch · HTML, CSS, vanilla JS · no dependencies · updated 2026-11-04
Demo: https://kodza.dev/components/signature-pad/
Source on GitHub: https://github.com/kodza-dev/kodza/tree/main/components/signature-pad

## Files

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

- [`kodza-signature-pad.css`](https://kodza.dev/registry/signature-pad/kodza-signature-pad.css) · 18.4 KB
- [`kodza-signature-pad.js`](https://kodza.dev/registry/signature-pad/kodza-signature-pad.js) · 23.4 KB
- [`kodza-signature-pad.html`](https://kodza.dev/registry/signature-pad/kodza-signature-pad.html) · 0.9 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-signature-pad.css https://kodza.dev/registry/signature-pad/kodza-signature-pad.css
curl -fsSL --create-dirs -o kodza/kodza-signature-pad.js https://kodza.dev/registry/signature-pad/kodza-signature-pad.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-signature`
- Variables (set them on the root element itself: it declares its own defaults):
  - `--kz-signature-bg: #ffffff`
  - `--kz-signature-fg: #0a0a0a`
  - `--kz-signature-muted: rgba(10, 10, 10, 0.6)`
  - `--kz-signature-line: rgba(10, 10, 10, 0.14)`
  - `--kz-signature-line-hover: rgba(10, 10, 10, 0.3)`
  - `--kz-signature-soft: rgba(10, 10, 10, 0.06)`
  - `--kz-signature-error: #0a0a0a` — a message, never colour alone: set a red here if you want one
  - `--kz-signature-ink: #0a0a0a` — the ink on screen
  - `--kz-signature-print: #0a0a0a` — the ink in the image the form gets, for a white page
  - `--kz-signature-pen-min: 0.8px` — the thinnest line, at full speed (read by the script)
  - `--kz-signature-pen-max: 3.2px` — the thickest, when the pen slows down
  - `--kz-signature-name-size: 34px` — the name typed on the line
  - `--kz-signature-height: 200px`
  - `--kz-signature-width: var(--kz-field-width, 480px)`
  - `--kz-signature-radius: calc(12px * var(--kz-radius-scale, 1))`
  - `--kz-signature-duration: 0.35s`
  - `--kz-signature-ease: cubic-bezier(0.22, 1, 0.36, 1)`
- Attributes:
  - `data-locale`
- Lifecycle: `kodza:init` / `kodza:destroy` on `document`, with `{ detail: { root } }` to target a container.

## Keyboard

What each key does, by where the focus is. Keep it working when you adapt the HTML: same elements, same classes.

- On the signature line (focus in `.kodza-signature__type`):
  - a letter: Types your name in place of a drawing
- On Undo (focus in `.kodza-signature__undo`):
  - `Enter` / `Space`: Removes the last stroke
- On Clear (focus in `.kodza-signature__clear`):
  - `Enter` / `Space`: Clears the drawing or the typed name

## 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-signature {
    --kz-signature-bg: #161616;
    --kz-signature-fg: #f2f2f0;
    --kz-signature-muted: rgba(242, 242, 240, 0.62);
    --kz-signature-line: rgba(255, 255, 255, 0.14);
    --kz-signature-line-hover: rgba(255, 255, 255, 0.3);
    --kz-signature-soft: rgba(255, 255, 255, 0.08);
    --kz-signature-error: #f2f2f0;
    --kz-signature-ink: #f2f2f0;
  }
}
```

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

## Use it

### Plain HTML page

- CSS: `kodza/kodza-signature-pad.css` next to the page (the Files commands as they are), linked in `<head>`: `<link rel="stylesheet" href="kodza/kodza-signature-pad.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-signature-pad.js`, loaded with `<script src="kodza/kodza-signature-pad.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. A site with its own type sets it once for every Kodza component, on `:root`, never by editing the CSS (unset, nothing changes): `--kz-font-display`, the display face (headings, big numbers, wordmarks); `--kz-font-display-weight`, its weight; `--kz-font-display-scale`, a multiplier on its sizes (1 by default); `--kz-font-display-tracking`, its letter-spacing; `--kz-font-display-case`, its case (`uppercase`…); `--kz-font-label`, the face of the small labels (meta, captions, counters, hints, footer links, button labels); `--kz-font-label-size`, their size, one for all of them (`11px`…); `--kz-font-label-weight`, their weight; `--kz-font-label-tracking`, their letter-spacing; `--kz-font-label-case`, their case (`uppercase`…; code and units keep theirs); `--kz-font-label-leading`, their line-height (`1.45`…; buttons, pills and keys keep their box). 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">`.
- Corners: a site with its own shapes sets them once for every Kodza component, on `:root`, never by editing the CSS (unset, nothing changes): `--kz-radius-scale` multiplies every corner (`0` square, `0.5` softer, `1` Kodza); `--kz-radius-pill` sets the pills (`0` squares them).
- Width: a form sets it once for every Kodza field, on the form or on `:root` (`--kz-field-width: 100%` fills the column). Unset, nothing changes.
- Motion: a site sets its pace once for every Kodza component, on `:root`, never by editing the CSS or the JS: `--kz-motion-scale` multiplies every duration (`0.5` twice as fast, `2` twice as slow, `0` no motion at all, loops stopped, like reduced motion). Unset, nothing changes.
- 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$/{r kodza/kodza-signature-pad.css' -e 'd' -e '}' -e '/^KODZA-JS$/{r kodza/kodza-signature-pad.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">`. A site with its own type sets it once for every Kodza component, on `:root`, never by editing the CSS (unset, nothing changes): `--kz-font-display`, the display face (headings, big numbers, wordmarks); `--kz-font-display-weight`, its weight; `--kz-font-display-scale`, a multiplier on its sizes (1 by default); `--kz-font-display-tracking`, its letter-spacing; `--kz-font-display-case`, its case (`uppercase`…); `--kz-font-label`, the face of the small labels (meta, captions, counters, hints, footer links, button labels); `--kz-font-label-size`, their size, one for all of them (`11px`…); `--kz-font-label-weight`, their weight; `--kz-font-label-tracking`, their letter-spacing; `--kz-font-label-case`, their case (`uppercase`…; code and units keep theirs); `--kz-font-label-leading`, their line-height (`1.45`…; buttons, pills and keys keep their box).
- Corners: a site with its own shapes sets them once for every Kodza component, on `:root`, never by editing the CSS (unset, nothing changes): `--kz-radius-scale` multiplies every corner (`0` square, `0.5` softer, `1` Kodza); `--kz-radius-pill` sets the pills (`0` squares them).
- Width: a form sets it once for every Kodza field, on the form or on `:root` (`--kz-field-width: 100%` fills the column). Unset, nothing changes.
- Motion: a site sets its pace once for every Kodza component, on `:root`, never by editing the CSS or the JS: `--kz-motion-scale` multiplies every duration (`0.5` twice as fast, `2` twice as slow, `0` no motion at all, loops stopped, like reduced motion). Unset, nothing changes.
- 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.
- Forms: there is nowhere to send them. Handle `submit` in your script with `event.preventDefault()` and show the result in the page.

### 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-signature-pad', $uri . 'kodza-signature-pad.css', [], filemtime($dir . 'kodza-signature-pad.css'));
    wp_enqueue_script('kodza-signature-pad', $uri . 'kodza-signature-pad.js', [], filemtime($dir . 'kodza-signature-pad.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-signature { --kz-signature-fg: var(TEXT, #0a0a0a); --kz-signature-ink: var(TEXT, #0a0a0a); --kz-signature-bg: var(BACKGROUND, #ffffff); }`
  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-signature-pad.css` and `assets/kodza-signature-pad.js` (the Files commands with `-o assets/…`).
- In the section: `{{ 'kodza-signature-pad.css' | asset_url | stylesheet_tag }}` and `<script src="{{ 'kodza-signature-pad.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/`): `SignaturePad.tsx` (below), the CSS block under Code saved as `signature-pad.css` and the JS block as `signature-pad.js`, both as they are. The HTML block is already inside the component: skip it.
- Use it: `import { SignaturePad } from '@/components/kodza/SignaturePad';` then `<SignaturePad />`. Props: `vars` (the `--kz-…` variables listed under API, e.g. `vars={{ '--kz-signature-bg': … }}`), `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 './signature-pad.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.
- Built from your data (tabs, rows, options)? Add what the markup is made of to the `key`, as plain values (ids, text, numbers). What the visitor changes (the open tab, the sort, what they type) is the script's: follow it with `onClick` or `onInput` on the root, and change it from your code as a visitor would (click the tab; set the field's value, then dispatch a bubbling `input` event). Fields stay uncontrolled (`defaultValue`, `name`).

```tsx
'use client';
// Kodza — Signature Pad, for React. From https://kodza.dev/components/signature-pad/
// 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: signature-pad.css and signature-pad.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.
// data-kodza-manual keeps the script from starting it on its own: the effect below does, once
// React has hydrated the markup (on a page that streams in, the script can load first).
// Built from your data (tabs, rows, options)? Put what the markup is made of in the key, as plain
// values (ids, text, numbers): a change starts the script again on fresh markup. What the visitor
// changes (the open tab, the sort, what they type) is the script's: keep it out of the key, follow
// it with onClick or onInput on the root, and change it from your code as a visitor would (click
// the tab; set the field's value, then dispatch a bubbling input event).
import { useRef, useEffect, type ComponentPropsWithoutRef, type ComponentRef, type CSSProperties } from 'react';
import './signature-pad.css';

export type SignaturePadProps = Omit<ComponentPropsWithoutRef<'div'>, "children" | "vars"> & {
  /** Settings, as CSS variables on the root */
  vars?: {
    /** default: #ffffff */
    "--kz-signature-bg"?: string | number;
    /** default: #0a0a0a */
    "--kz-signature-fg"?: string | number;
    /** default: rgba(10, 10, 10, 0.6) */
    "--kz-signature-muted"?: string | number;
    /** default: rgba(10, 10, 10, 0.14) */
    "--kz-signature-line"?: string | number;
    /** default: rgba(10, 10, 10, 0.3) */
    "--kz-signature-line-hover"?: string | number;
    /** default: rgba(10, 10, 10, 0.06) */
    "--kz-signature-soft"?: string | number;
    /** a message, never colour alone: set a red here if you want one — default: #0a0a0a */
    "--kz-signature-error"?: string | number;
    /** the ink on screen — default: #0a0a0a */
    "--kz-signature-ink"?: string | number;
    /** the ink in the image the form gets, for a white page — default: #0a0a0a */
    "--kz-signature-print"?: string | number;
    /** the thinnest line, at full speed (read by the script) — default: 0.8px */
    "--kz-signature-pen-min"?: string | number;
    /** the thickest, when the pen slows down — default: 3.2px */
    "--kz-signature-pen-max"?: string | number;
    /** the name typed on the line — default: 34px */
    "--kz-signature-name-size"?: string | number;
    /** default: 200px */
    "--kz-signature-height"?: string | number;
    /** default: var(--kz-field-width, 480px) */
    "--kz-signature-width"?: string | number;
    /** default: calc(12px * var(--kz-radius-scale, 1)) */
    "--kz-signature-radius"?: string | number;
    /** default: 0.35s */
    "--kz-signature-duration"?: string | number;
    /** default: cubic-bezier(0.22, 1, 0.36, 1) */
    "--kz-signature-ease"?: string | number;
  };
  className?: string;
};

export function SignaturePad({ vars, className, style, ...rest }: SignaturePadProps) {
  const ref = useRef<ComponentRef<'div'>>(null);
  const classes = ["kodza-signature", 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('./signature-pad.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} data-kodza-manual style={{ ...vars, ...style } as CSSProperties} ref={ref}>
      <div className="kodza-signature__pad">
        <label className="kodza-signature__write">
          <span className="kodza-signature__label">Signature, quote #2048</span>
          {' '}
          <input className="kodza-signature__type" type="text" name="signed-by" autoComplete="name" spellCheck="false" required />
          {' '}
          <span className="kodza-signature__prompt" aria-hidden="true">
            <span className="kodza-signature__say">Sign here</span>
          </span>
        </label>
        <div className="kodza-signature__tools">
          <button className="kodza-signature__undo" type="button">Undo</button>
          {' '}
          <button className="kodza-signature__clear" type="button">Clear</button>
        </div>
      </div>
      <input className="kodza-signature__value" type="hidden" name="signature" />
      <p className="kodza-signature__note">
        <span className="kodza-signature__hint">Finger, mouse or stylus. Keyboard? Type your name.</span>
        {' '}
        <span className="kodza-signature__error" aria-live="polite" />
      </p>
    </div>
  );
}
```

## Code

```html
<div class="kodza-signature">
  <div class="kodza-signature__pad">
    <label class="kodza-signature__write">
      <span class="kodza-signature__label">Signature, quote #2048</span>
      <input class="kodza-signature__type" type="text" name="signed-by" autocomplete="name" spellcheck="false" required>
      <span class="kodza-signature__prompt" aria-hidden="true"><span class="kodza-signature__say">Sign here</span></span>
    </label>
    <div class="kodza-signature__tools">
      <button class="kodza-signature__undo" type="button">Undo</button>
      <button class="kodza-signature__clear" type="button">Clear</button>
    </div>
  </div>
  <input class="kodza-signature__value" type="hidden" name="signature">
  <p class="kodza-signature__note">
    <span class="kodza-signature__hint">Finger, mouse or stylus. Keyboard? Type your name.</span>
    <span class="kodza-signature__error" aria-live="polite"></span>
  </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 — Signature Pad
   A box to sign in, over a line with its little cross. The ink thins as the pen speeds up, like
   a real nib, with finger, mouse or stylus. Undo makes the last stroke back out along its own
   path; Clear wipes the box from left to right. With a keyboard, the name typed on the line is
   the signature, in the display font. The form gets a trimmed PNG (data URL) under the hidden
   input's name, printed in black whatever the theme. Without JS, the name field stays.
   Same box as Text Field. Everything is tuned with the --kz-signature-* variables; the words
   and timings, at the top of the script. */
.kodza-signature {
  --kz-signature-bg: #ffffff;
  --kz-signature-fg: #0a0a0a;
  --kz-signature-muted: rgba(10, 10, 10, 0.6);
  --kz-signature-line: rgba(10, 10, 10, 0.14);
  --kz-signature-line-hover: rgba(10, 10, 10, 0.3);
  --kz-signature-soft: rgba(10, 10, 10, 0.06);
  --kz-signature-error: #0a0a0a; /* a message, never colour alone: set a red here if you want one */
  --kz-signature-ink: #0a0a0a; /* the ink on screen */
  --kz-signature-print: #0a0a0a; /* the ink in the image the form gets, for a white page */
  --kz-signature-pen-min: 0.8px; /* the thinnest line, at full speed (read by the script) */
  --kz-signature-pen-max: 3.2px; /* the thickest, when the pen slows down */
  --kz-signature-name-size: 34px; /* the name typed on the line */
  --kz-signature-height: 200px;
  --kz-signature-width: var(--kz-field-width, 480px);
  --kz-signature-radius: calc(12px * var(--kz-radius-scale, 1));
  --kz-signature-duration: 0.35s;
  --kz-signature-ease: cubic-bezier(0.22, 1, 0.36, 1);

  display: grid;
  gap: 8px;
  width: 100%;
  max-width: var(--kz-signature-width);
  color: var(--kz-signature-fg);
}

/* The box: the label on top, the tools on the right, the line near the bottom */
.kodza-signature__pad {
  position: relative;
  display: block;
  height: var(--kz-signature-height);
  margin: 0;
  padding: 0;
  border-radius: var(--kz-signature-radius);
  background: var(--kz-signature-bg);
  box-shadow: inset 0 0 0 1px var(--kz-signature-line);
  transition: box-shadow calc(0.25s * var(--kz-motion-scale, 1)) ease;
}

.kodza-signature__pad:hover {
  box-shadow: inset 0 0 0 1px var(--kz-signature-line-hover);
}

.kodza-signature.is-invalid .kodza-signature__pad {
  box-shadow: inset 0 0 0 1.5px var(--kz-signature-error);
}

/* The line to sign on, and its cross */
.kodza-signature__pad::before {
  content: "";
  position: absolute;
  right: 24px;
  bottom: 52px;
  left: 40px;
  height: 1px;
  background: var(--kz-signature-line-hover);
}

.kodza-signature__pad::after {
  content: "";
  position: absolute;
  bottom: 58px;
  left: 20px;
  width: 9px;
  height: 9px;
  background: var(--kz-signature-muted);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 10'%3E%3Cpath d='M1 1l8 8M9 1L1 9' stroke='black' stroke-width='1.4' stroke-linecap='round'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 10'%3E%3Cpath d='M1 1l8 8M9 1L1 9' stroke='black' stroke-width='1.4' stroke-linecap='round'/%3E%3C/svg%3E") center / contain no-repeat;
}

/* The ink, drawn by the script over the line */
.kodza-signature__ink {
  position: absolute;
  z-index: 1;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  color: var(--kz-signature-ink); /* read by the script */
  cursor: crosshair;
  touch-action: none;
}

/* The name field, over the whole box. Once the script runs the pointer goes through it to the
   ink; the keyboard still reaches the field, and a name already typed takes the pointer back */
.kodza-signature__write {
  position: absolute;
  z-index: 2;
  inset: 0;
  display: block;
  margin: 0;
  padding: 0;
  border-radius: inherit;
  cursor: text;
}

.kodza-signature.is-ready .kodza-signature__write {
  pointer-events: none;
}

.kodza-signature.is-ready.is-typed .kodza-signature__type {
  pointer-events: auto;
}

/* Typing: the box is the one in use */
.kodza-signature__write::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1.5px transparent, 0 0 0 4px transparent;
  pointer-events: none;
  transition: box-shadow calc(0.25s * var(--kz-motion-scale, 1)) ease;
}

.kodza-signature__write:focus-within::after {
  box-shadow: inset 0 0 0 1.5px var(--kz-signature-fg), 0 0 0 4px var(--kz-signature-soft);
}

.kodza-signature.is-invalid .kodza-signature__write:focus-within::after {
  box-shadow: inset 0 0 0 1.5px var(--kz-signature-error), 0 0 0 4px var(--kz-signature-soft);
}

.kodza-signature__label {
  position: absolute;
  top: 14px;
  left: 16px;
  color: var(--kz-signature-muted);
  font-size: 12px;
  line-height: 1.2;
  white-space: nowrap;
}

/* The name typed on the line, in the display font */
.kodza-signature__type {
  position: absolute;
  right: 24px;
  bottom: 42px;
  left: 40px;
  box-sizing: border-box;
  width: auto;
  height: 50px;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  outline: none;
  background: transparent;
  box-shadow: none;
  color: var(--kz-signature-ink);
  caret-color: var(--kz-signature-fg);
  font-family: var(--kz-font-display, inherit);
  font-size: calc(var(--kz-signature-name-size) * var(--kz-font-display-scale, 1));
  font-style: italic;
  font-weight: var(--kz-font-display-weight, 400);
  letter-spacing: var(--kz-font-display-tracking, -0.02em);
  line-height: 50px;
  text-transform: var(--kz-font-display-case, none);
  appearance: none;
}

/* Under the line: what to do now, then when it was signed */
.kodza-signature__prompt {
  position: absolute;
  bottom: 24px;
  left: 40px;
  display: grid;
  overflow: hidden;
  color: var(--kz-signature-muted);
  font-family: var(--kz-font-label, inherit);
  font-size: var(--kz-font-label-size, 12px);
  font-weight: var(--kz-font-label-weight, inherit);
  letter-spacing: var(--kz-font-label-tracking, inherit);
  line-height: var(--kz-font-label-leading, 1.4);
  text-transform: var(--kz-font-label-case, inherit);
  white-space: nowrap;
  pointer-events: none;
}

.kodza-signature__say {
  grid-area: 1 / 1;
}

/* Undo once there is ink, Clear once there is a signature, drawn or typed */
.kodza-signature__tools {
  position: absolute;
  z-index: 3;
  top: 10px;
  right: 10px;
  display: flex;
  gap: 2px;
}

.kodza-signature__undo,
.kodza-signature__clear {
  display: inline-flex;
  align-items: center;
  box-sizing: border-box;
  height: 28px;
  margin: 0;
  padding: 0 11px;
  border: 0;
  border-radius: var(--kz-radius-pill, 999px);
  outline: none;
  background: transparent;
  color: var(--kz-signature-muted);
  font-family: var(--kz-font-label, inherit);
  font-size: var(--kz-font-label-size, 12px);
  font-weight: var(--kz-font-label-weight, 500);
  letter-spacing: var(--kz-font-label-tracking, revert);
  line-height: 1;
  text-transform: var(--kz-font-label-case, revert);
  cursor: pointer;
  opacity: 0;
  transform: translateY(-6px);
  visibility: hidden;
  transition:
    opacity calc(var(--kz-signature-duration) * 0.625 * var(--kz-motion-scale, 1)) ease,
    transform calc(var(--kz-signature-duration) * var(--kz-motion-scale, 1)) var(--kz-signature-ease),
    visibility 0s linear calc(var(--kz-signature-duration) * var(--kz-motion-scale, 1)),
    background-color calc(0.2s * var(--kz-motion-scale, 1)) ease,
    color calc(0.2s * var(--kz-motion-scale, 1)) ease;
}

.kodza-signature.is-inked .kodza-signature__undo,
.kodza-signature.is-filled .kodza-signature__clear {
  opacity: 1;
  transform: none;
  visibility: visible;
  transition-delay: 0s;
}

.kodza-signature__undo:hover,
.kodza-signature__clear:hover {
  background: var(--kz-signature-soft);
  color: var(--kz-signature-fg);
}

.kodza-signature__undo:focus-visible,
.kodza-signature__clear:focus-visible {
  background: var(--kz-signature-soft);
  box-shadow: inset 0 0 0 1.5px var(--kz-signature-fg);
  color: var(--kz-signature-fg);
}

/* Hint and error share one line: the hint steps out upward as the error rises in */
.kodza-signature__note {
  display: grid;
  margin: 0;
  padding: 0 2px;
  overflow: hidden;
  font-family: var(--kz-font-label, inherit);
  font-size: var(--kz-font-label-size, 13px);
  font-weight: var(--kz-font-label-weight, inherit);
  letter-spacing: var(--kz-font-label-tracking, inherit);
  line-height: var(--kz-font-label-leading, 1.4);
  text-transform: var(--kz-font-label-case, inherit);
}

.kodza-signature__hint,
.kodza-signature__error {
  grid-area: 1 / 1;
  transition:
    opacity calc(var(--kz-signature-duration) * 0.625 * var(--kz-motion-scale, 1)) ease,
    transform calc(var(--kz-signature-duration) * var(--kz-motion-scale, 1)) var(--kz-signature-ease);
}

.kodza-signature__hint {
  color: var(--kz-signature-muted);
}

.kodza-signature__error {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--kz-signature-error);
  font-weight: var(--kz-font-label-weight, 500);
  opacity: 0;
  transform: translateY(100%);
}

.kodza-signature__error::before {
  content: "";
  flex: none;
  width: 14px;
  height: 14px;
  background: currentColor;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Ccircle cx='8' cy='8' r='6.5' fill='none' stroke='black' stroke-width='1.5'/%3E%3Cpath d='M8 4.5v4.2M8 10.9v.1' stroke='black' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Ccircle cx='8' cy='8' r='6.5' fill='none' stroke='black' stroke-width='1.5'/%3E%3Cpath d='M8 4.5v4.2M8 10.9v.1' stroke='black' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E") center / contain no-repeat;
}

.kodza-signature.is-invalid .kodza-signature__hint {
  opacity: 0;
  transform: translateY(-100%);
}

.kodza-signature.is-invalid .kodza-signature__error {
  opacity: 1;
  transform: none;
}

/* What screen readers hear: a stroke undone, the box cleared */
.kodza-signature__live {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  .kodza-signature__pad,
  .kodza-signature__write::after,
  .kodza-signature__undo,
  .kodza-signature__clear,
  .kodza-signature__hint,
  .kodza-signature__error {
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }
}

/* Theming example — on a dark background:
.dark-section .kodza-signature {
  --kz-signature-bg: #161616;
  --kz-signature-fg: #f2f2f0;
  --kz-signature-muted: rgba(242, 242, 240, 0.62);
  --kz-signature-line: rgba(255, 255, 255, 0.14);
  --kz-signature-line-hover: rgba(255, 255, 255, 0.3);
  --kz-signature-soft: rgba(255, 255, 255, 0.08);
  --kz-signature-error: #f2f2f0;
  --kz-signature-ink: #f2f2f0;
}
*/

/* kodza-guard 8694a0e5a488 — 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-signature__undo):not(#_),
:where(.kodza-signature__clear):not(#_) {
  box-shadow: revert;
}

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

.kodza-signature:not(#_),
.kodza-signature__pad:not(#_),
.kodza-signature__ink:not(#_),
.kodza-signature__label:not(#_),
.kodza-signature__prompt:not(#_),
.kodza-signature__say:not(#_),
.kodza-signature__tools:not(#_),
.kodza-signature__hint:not(#_),
.kodza-signature__error:not(#_),
.kodza-signature__live:not(#_) {
  box-sizing: revert;
}

.kodza-signature__write:not(#_) {
  border: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: 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-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-signature__type:not(#_) {
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  float: revert;
  outline-offset: revert;
  max-width: revert;
  max-height: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
  white-space: revert;
  min-height: revert;
}

.kodza-signature__undo:not(#_),
.kodza-signature__clear:not(#_) {
  text-decoration: revert;
  list-style: revert;
  float: revert;
  position: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  font-style: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
  white-space: revert;
  min-height: revert;
}

.kodza-signature__value:not(#_) {
  border: revert;
  margin: 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-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
  white-space: revert;
  min-height: revert;
}

.kodza-signature__note:not(#_) {
  border: 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-style: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

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

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

.kodza-signature__pad:not(#_)::before,
.kodza-signature__pad:not(#_)::after,
.kodza-signature__write:not(#_)::after,
.kodza-signature__error:not(#_)::before {
  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-signature:not(#_) {
  width: min(100%, var(--kz-signature-width));
}

.kodza-signature__write:not(#_) {
  position: absolute;
  display: block;
  margin: 0;
  padding: 0;
  border-radius: inherit;
}

.kodza-signature.is-ready.is-typed .kodza-signature__type:not(#_) {
  pointer-events: auto;
}

.kodza-signature__type:not(#_) {
  position: absolute;
  right: 24px;
  bottom: 42px;
  left: 40px;
  box-sizing: border-box;
  width: auto;
  height: 50px;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  outline: none;
  background: transparent;
  box-shadow: none;
  color: var(--kz-signature-ink);
  caret-color: var(--kz-signature-fg);
  font-family: var(--kz-font-display, inherit);
  font-size: calc(var(--kz-signature-name-size) * var(--kz-font-display-scale, 1));
  font-style: italic;
  font-weight: var(--kz-font-display-weight, 400);
  letter-spacing: var(--kz-font-display-tracking, -0.02em);
  line-height: 50px;
  text-transform: var(--kz-font-display-case, none);
  appearance: none;
}

.kodza-signature__undo:not(#_),
.kodza-signature__clear:not(#_) {
  display: inline-flex;
  align-items: center;
  box-sizing: border-box;
  height: 28px;
  margin: 0;
  padding: 0 11px;
  border: 0;
  border-radius: var(--kz-radius-pill, 999px);
  outline: none;
  background: transparent;
  color: var(--kz-signature-muted);
  font-family: var(--kz-font-label, inherit);
  font-size: var(--kz-font-label-size, 12px);
  font-weight: var(--kz-font-label-weight, 500);
  letter-spacing: var(--kz-font-label-tracking, revert);
  line-height: 1;
  text-transform: var(--kz-font-label-case, revert);
  cursor: pointer;
  opacity: 0;
  transform: translateY(-6px);
  visibility: hidden;
  transition: opacity calc(var(--kz-signature-duration) * 0.625 * var(--kz-motion-scale, 1)) ease,
    transform calc(var(--kz-signature-duration) * var(--kz-motion-scale, 1)) var(--kz-signature-ease),
    visibility 0s linear calc(var(--kz-signature-duration) * var(--kz-motion-scale, 1)),
    background-color calc(0.2s * var(--kz-motion-scale, 1)) ease,
    color calc(0.2s * var(--kz-motion-scale, 1)) ease;
}

.kodza-signature.is-inked .kodza-signature__undo:not(#_),
.kodza-signature.is-filled .kodza-signature__clear:not(#_) {
  opacity: 1;
  transform: none;
  visibility: visible;
  transition-delay: 0s;
}

.kodza-signature__undo:hover:not(#_),
.kodza-signature__clear:hover:not(#_) {
  background: var(--kz-signature-soft);
  color: var(--kz-signature-fg);
}

.kodza-signature__undo:focus-visible:not(#_),
.kodza-signature__clear:focus-visible:not(#_) {
  background: var(--kz-signature-soft);
  box-shadow: inset 0 0 0 1.5px var(--kz-signature-fg);
  color: var(--kz-signature-fg);
}

.kodza-signature__note:not(#_) {
  display: grid;
  margin: 0;
  padding: 0 2px;
  font-family: var(--kz-font-label, inherit);
  font-size: var(--kz-font-label-size, 13px);
  font-weight: var(--kz-font-label-weight, inherit);
  letter-spacing: var(--kz-font-label-tracking, inherit);
  line-height: var(--kz-font-label-leading, 1.4);
  text-transform: var(--kz-font-label-case, inherit);
}

@media (prefers-reduced-motion: reduce) {
  .kodza-signature__undo:not(#_),
  .kodza-signature__clear:not(#_) {
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }
}
```

```js
// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Kodza — Signature Pad
// A box to sign in with a finger, a mouse or a stylus. The ink thins as the pen speeds up and
// thickens as it slows, like a nib. Undo makes the last stroke back out along its own path; Clear
// wipes the box from left to right. With a keyboard, the name typed on the line is the signature.
// Under the line, "Sign here" rolls to "Signed 4 Nov 2026" once signed. The form gets a trimmed
// PNG (a data URL) from the hidden input, printed in --kz-signature-print on a transparent ground,
// and the typed name under the field's own name; a required field asks for one or the other.
// Settings: --kz-signature-* in the CSS (the pen widths too), data-locale (the language of the
// date, else the page's). The words and timings are below; each word can be set per pad with
// data-text-<name> (data-text-sign="…"), {date} is filled in.
(() => {
  const SELECTOR = '.kodza-signature';
  const WORDS = {
    sign: 'Sign here', // under the line, before anything
    type: 'Type your name', // under the line, while the name field has the focus
    signed: 'Signed {date}', // under the line, once signed
    required: 'Sign first. Or type your name.',
    undone: 'Last stroke removed', // read out
    cleared: 'Signature cleared', // read out
  };
  const UNDO = 400; // ms, the last stroke backing out
  const SWEEP = 600; // ms, Clear wiping the box
  const SWEEP_EASE = 'cubic-bezier(0.65, 0, 0.35, 1)';
  const ROLL = 420; // ms, the words under the line rolling
  const SMOOTHING = 0.7; // how much the newest pen speed counts against the one before (0 to 1)
  const MIN_STEP = 1.5; // px, a point closer than this to the last one is skipped
  const STEP = 0.5; // px between two dabs of ink along a stroke
  const MARGIN = 8; // px around the signature in the image the form gets
  const ease = 'cubic-bezier(0.22, 1, 0.36, 1)';
  // SWEEP_EASE for a stroke drawn frame by frame
  const easeInOut = (t) => (t < 0.5 ? 4 * t * t * t : 1 - (-2 * t + 2) ** 3 / 2);

  const reduceMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  // The site's pace, --kz-motion-scale (set on :root, read on the instance): every duration of the
  // script times it, and 0 moves nothing, like reduced motion
  const paceOf = (el) => {
    const pace = parseFloat(getComputedStyle(el).getPropertyValue('--kz-motion-scale'));
    return pace >= 0 ? pace : 1;
  };
  const mid = (p, q) => ({ x: (p.x + q.x) / 2, y: (p.y + q.y) / 2 });
  // Dabs of ink along a quadratic curve from a to c, bent by b, the width going the same way
  const curve = (out, a, b, c, wa, wb, wc) => {
    const length = Math.hypot(b.x - a.x, b.y - a.y) + Math.hypot(c.x - b.x, c.y - b.y);
    const steps = Math.max(1, Math.ceil(length / STEP));
    for (let i = 1; i <= steps; i++) {
      const t = i / steps;
      const u = 1 - t;
      out.push(u * u * a.x + 2 * u * t * b.x + t * t * c.x, u * u * a.y + 2 * u * t * b.y + t * t * c.y, u * u * wa + 2 * u * t * wb + t * t * wc);
    }
  };
  // The pieces of a stroke its points now settle: a dab at the start, a line to the first
  // midpoint, one curve per point from midpoint to midpoint, and the last line once the pen lifts
  const extend = (line, ended) => {
    const { points: p, samples } = line;
    const n = p.length;
    if (!samples.length && n) samples.push(p[0].x, p[0].y, p[0].w);
    for (; line.pieces < n - 1; line.pieces++) {
      const k = line.pieces;
      if (!k) {
        const m = mid(p[0], p[1]);
        curve(samples, p[0], mid(p[0], m), m, p[0].w, (3 * p[0].w + p[1].w) / 4, (p[0].w + p[1].w) / 2);
      } else curve(samples, mid(p[k - 1], p[k]), p[k], mid(p[k], p[k + 1]), (p[k - 1].w + p[k].w) / 2, p[k].w, (p[k].w + p[k + 1].w) / 2);
    }
    if (ended && n > 1) {
      const m = mid(p[n - 2], p[n - 1]);
      curve(samples, m, mid(m, p[n - 1]), p[n - 1], (p[n - 2].w + p[n - 1].w) / 2, (p[n - 2].w + 3 * p[n - 1].w) / 4, p[n - 1].w);
    }
  };
  // One round dab per sample, filled at once: [x, y, width, x, y, width, …]
  const paint = (context, samples, from = 0, to = samples.length) => {
    context.beginPath();
    for (let i = from; i < to; i += 3) {
      const r = samples[i + 2] / 2;
      context.moveTo(samples[i] + r, samples[i + 1]);
      context.arc(samples[i], samples[i + 1], r, 0, Math.PI * 2);
    }
    context.fill();
  };
  let uid = 0;

  // One instance. Everything it starts is tied to `signal`, so kodza:destroy stops it all
  function mount(root, signal) {
    const pad = root.querySelector('.kodza-signature__pad');
    const type = root.querySelector('.kodza-signature__type');
    const prompt = root.querySelector('.kodza-signature__prompt');
    const undo = root.querySelector('.kodza-signature__undo');
    const clear = root.querySelector('.kodza-signature__clear');
    const value = root.querySelector('.kodza-signature__value');
    const hint = root.querySelector('.kodza-signature__hint');
    const error = root.querySelector('.kodza-signature__error');
    if (!pad || !type) return;
    const id = `kodza-signature-${++uid}`;
    const word = (key) => root.dataset[`text${key[0].toUpperCase()}${key.slice(1)}`] || WORDS[key];
    const lang = root.dataset.locale || root.closest('[lang]')?.lang || navigator.language || 'en';
    const today = () => {
      try {
        return new Intl.DateTimeFormat(lang, { dateStyle: 'medium' }).format(new Date());
      } catch {
        return new Date().toLocaleDateString();
      }
    };

    const described = [];
    if (hint) described.push((hint.id = `${id}-hint`));
    if (error) described.push((error.id = `${id}-error`));
    if (described.length) type.setAttribute('aria-describedby', described.join(' '));
    // Required means a drawing or a name: the script checks for either one
    const required = type.required;
    if (required) {
      type.required = false;
      type.setAttribute('aria-required', 'true');
    }

    const canvas = document.createElement('canvas');
    canvas.className = 'kodza-signature__ink';
    canvas.setAttribute('aria-hidden', 'true');
    pad.prepend(canvas);
    const ctx = canvas.getContext('2d');
    // The strokes that stay, drawn once while the last one backs out over them
    const base = document.createElement('canvas');
    const baseCtx = base.getContext('2d');
    const live = document.createElement('span');
    live.className = 'kodza-signature__live';
    live.setAttribute('aria-live', 'polite');
    root.append(live);

    let width = 0;
    let height = 0;
    let ratio = 0;
    let strokes = []; // each { points: [{ x, y, t, w }], samples: [x, y, w, …], pieces }
    let stroke = null; // the one being drawn
    let pointer = null;
    let velocity = 0;
    let pens = [0.8, 3.2];
    let backing = 0; // the frame of the stroke backing out
    let textGoing = false; // the typed name is being wiped
    const wipes = new Set();
    let shown = prompt?.querySelector('.kodza-signature__say');

    const style = () => getComputedStyle(root);
    const inkOf = () => getComputedStyle(canvas).color;
    const typed = () => !textGoing && type.value.trim() !== '';

    const redraw = () => {
      ctx.clearRect(0, 0, width, height);
      ctx.fillStyle = inkOf();
      strokes.forEach((line) => paint(ctx, line.samples));
    };

    // The canvas at the box's size, in device pixels (times the scale of a parent's transform);
    // the strokes follow a new width, held on the line near the bottom
    const size = () => {
      const w = canvas.offsetWidth;
      const h = canvas.offsetHeight;
      if (!w || !h) return;
      const r = (window.devicePixelRatio || 1) * (canvas.getBoundingClientRect().width / w || 1);
      if (w === width && h === height && r === ratio) return;
      if (width && w !== width) {
        const k = w / width;
        strokes.forEach((line) => {
          line.points.forEach((point) => {
            point.x *= k;
            point.y = h - (height - point.y) * k;
          });
          line.samples = [];
          line.pieces = 0;
          extend(line, true);
        });
      }
      width = w;
      height = h;
      ratio = r;
      [canvas, base].forEach((each) => {
        each.width = Math.round(w * r);
        each.height = Math.round(h * r);
      });
      ctx.setTransform(r, 0, 0, r, 0, 0);
      baseCtx.setTransform(r, 0, 0, r, 0, 0);
      redraw();
    };

    // Under the line, the old words go up as the new ones come in from below
    const roll = (text, animate = true) => {
      if (!shown || shown.textContent === text) return;
      const pace = paceOf(root);
      if (!animate || reduceMotion || !pace) {
        shown.textContent = text;
        return;
      }
      const old = shown;
      shown = old.cloneNode();
      shown.textContent = text;
      prompt.append(shown);
      const timing = { duration: ROLL * pace, easing: ease };
      const gone = () => old.remove();
      old.animate([{ transform: 'none', opacity: 1 }, { transform: 'translateY(-100%)', opacity: 0 }], { ...timing, fill: 'forwards' }).finished.then(gone, gone);
      shown.animate([{ transform: 'translateY(100%)', opacity: 0 }, { transform: 'none', opacity: 1 }], timing);
    };

    // Hint and error share the line under the box
    const say = (text) => {
      if (!error) return;
      error.textContent = text;
      root.classList.add('is-invalid');
      type.setAttribute('aria-invalid', 'true');
    };
    const clearError = () => {
      root.classList.remove('is-invalid');
      type.removeAttribute('aria-invalid');
    };

    // A tool that hides under the keyboard's focus hands it on: to Clear while it shows, else to
    // the name field. Under the mouse it is let go
    const handOn = (tool) => {
      if (!tool || document.activeElement !== tool || !tool.matches(':focus-visible')) return;
      (tool !== clear && clear && root.classList.contains('is-filled') ? clear : type).focus({ preventScroll: true });
    };

    const sync = (animate = true) => {
      const inked = strokes.length > 0;
      const signed = inked || typed();
      root.classList.toggle('is-inked', inked);
      root.classList.toggle('is-typed', typed());
      root.classList.toggle('is-filled', signed);
      if (!inked) handOn(undo);
      if (!signed) handOn(clear);
      roll(signed ? word('signed').replace('{date}', today()) : document.activeElement === type ? word('type') : word('sign'), animate);
      if (required) type.setCustomValidity(signed ? '' : word('required'));
      if (signed) clearError();
    };

    // The image the form gets: the ink, or the typed name in the field's font, trimmed to it, at
    // twice the size. A hidden input sends no event of its own: "change" bubbles from it
    const output = () => {
      if (!value) return;
      const name = typed() ? type.value.trim() : '';
      let data = '';
      if (strokes.length || name) {
        const sheet = document.createElement('canvas');
        const pen = sheet.getContext('2d');
        let left = Infinity;
        let top = Infinity;
        let right = -Infinity;
        let bottom = -Infinity;
        let metrics = null;
        const font = getComputedStyle(type);
        const text = font.textTransform === 'uppercase' ? name.toUpperCase() : font.textTransform === 'lowercase' ? name.toLowerCase() : name;
        const setFont = () => {
          pen.font = `${font.fontStyle} ${font.fontWeight} ${font.fontSize} ${font.fontFamily}`;
          if ('letterSpacing' in pen) pen.letterSpacing = font.letterSpacing === 'normal' ? '0px' : font.letterSpacing;
        };
        if (strokes.length) {
          strokes.forEach(({ samples }) => {
            for (let i = 0; i < samples.length; i += 3) {
              const r = samples[i + 2] / 2;
              left = Math.min(left, samples[i] - r);
              right = Math.max(right, samples[i] + r);
              top = Math.min(top, samples[i + 1] - r);
              bottom = Math.max(bottom, samples[i + 1] + r);
            }
          });
        } else {
          setFont();
          metrics = pen.measureText(text);
          left = -metrics.actualBoundingBoxLeft;
          right = metrics.actualBoundingBoxRight;
          top = -metrics.actualBoundingBoxAscent;
          bottom = metrics.actualBoundingBoxDescent;
        }
        sheet.width = Math.ceil((right - left + MARGIN * 2) * 2);
        sheet.height = Math.ceil((bottom - top + MARGIN * 2) * 2);
        pen.setTransform(2, 0, 0, 2, (MARGIN - left) * 2, (MARGIN - top) * 2);
        pen.fillStyle = '#0a0a0a';
        pen.fillStyle = style().getPropertyValue('--kz-signature-print').trim() || '#0a0a0a';
        if (metrics) {
          setFont();
          pen.fillText(text, 0, 0);
        } else strokes.forEach(({ samples }) => paint(pen, samples));
        data = sheet.toDataURL('image/png');
      }
      if (value.value === data) return;
      value.value = data;
      value.dispatchEvent(new Event('change', { bubbles: true }));
    };

    // Clear's sweep, from left to right, on the ink or the typed name; `done` runs underneath it
    // just before it lifts, at its end or as soon as something new starts
    const wipe = (el, done) => {
      const pace = paceOf(root);
      if (reduceMotion || !pace) return done();
      const anim = el.animate([{ clipPath: 'inset(0 0 0 0)' }, { clipPath: 'inset(0 0 0 100%)' }], { duration: SWEEP * pace, easing: SWEEP_EASE, fill: 'forwards' });
      const entry = { anim, finish: () => {
        if (!wipes.delete(entry)) return;
        done();
        anim.cancel();
        sync();
        output();
      } };
      wipes.add(entry);
      anim.finished.then(entry.finish, () => {});
    };
    const settle = () => [...wipes].forEach((entry) => entry.finish());

    const stopBacking = () => {
      if (!backing) return;
      cancelAnimationFrame(backing);
      backing = 0;
      redraw();
    };
    const dropInk = () => {
      if (!strokes.length) return;
      stopBacking();
      strokes = [];
      wipe(canvas, redraw);
    };
    const dropName = () => {
      if (!typed()) return;
      textGoing = true;
      wipe(type, () => {
        type.value = '';
        textGoing = false;
      });
    };

    // Drawing. The pointer's place is divided by the scale of a parent's transform
    const at = (event, rect) => {
      const scale = rect.width / canvas.offsetWidth || 1;
      return { x: (event.clientX - rect.left) / scale, y: (event.clientY - rect.top) / scale, t: event.timeStamp };
    };
    // The width from the pen's speed (px/ms), smoothed: fast and thin, slow and full
    const add = (point) => {
      const points = stroke.points;
      const last = points[points.length - 1];
      if (last) {
        const distance = Math.hypot(point.x - last.x, point.y - last.y);
        if (distance < MIN_STEP) return;
        velocity = SMOOTHING * (distance / Math.max(point.t - last.t, 1)) + (1 - SMOOTHING) * velocity;
        point.w = Math.max(pens[1] / (velocity + 1), pens[0]);
      } else {
        velocity = 0;
        point.w = (pens[0] + pens[1]) / 2;
      }
      points.push(point);
      const from = stroke.samples.length;
      extend(stroke, false);
      paint(ctx, stroke.samples, from);
    };

    canvas.addEventListener('pointerdown', (event) => {
      if (event.button !== 0 || stroke || type.matches(':disabled')) return;
      event.preventDefault();
      settle();
      stopBacking();
      size();
      if (document.activeElement === type) type.blur();
      dropName();
      pointer = event.pointerId;
      try {
        canvas.setPointerCapture(pointer);
      } catch {}
      const css = style();
      const min = parseFloat(css.getPropertyValue('--kz-signature-pen-min'));
      const max = parseFloat(css.getPropertyValue('--kz-signature-pen-max'));
      pens = [min > 0 ? min : 0.8, max > 0 ? max : 3.2];
      ctx.fillStyle = inkOf();
      stroke = { points: [], samples: [], pieces: 0 };
      strokes.push(stroke);
      add(at(event, canvas.getBoundingClientRect()));
    }, { signal });

    canvas.addEventListener('pointermove', (event) => {
      if (!stroke || event.pointerId !== pointer) return;
      const rect = canvas.getBoundingClientRect();
      const events = event.getCoalescedEvents?.() || [];
      (events.length ? events : [event]).forEach((each) => add(at(each, rect)));
    }, { signal });

    const end = (event) => {
      if (!stroke || event.pointerId !== pointer) return;
      const line = stroke;
      stroke = null;
      pointer = null;
      const from = line.samples.length;
      extend(line, true);
      paint(ctx, line.samples, from);
      sync();
      output();
    };
    ['pointerup', 'pointercancel', 'lostpointercapture'].forEach((name) => canvas.addEventListener(name, end, { signal }));

    // Undo: the last stroke runs back along its own path, over the ones that stay
    undo?.addEventListener('click', () => {
      if (stroke || !strokes.length) return;
      settle();
      stopBacking();
      const line = strokes.pop();
      live.textContent = word('undone');
      sync();
      output();
      const pace = paceOf(root);
      if (reduceMotion || !pace) return redraw();
      baseCtx.clearRect(0, 0, width, height);
      baseCtx.fillStyle = inkOf();
      strokes.forEach((other) => paint(baseCtx, other.samples));
      ctx.fillStyle = baseCtx.fillStyle;
      const count = line.samples.length / 3;
      const start = performance.now();
      const frame = (now) => {
        const progress = Math.min((now - start) / (UNDO * pace), 1);
        ctx.clearRect(0, 0, width, height);
        ctx.drawImage(base, 0, 0, width, height);
        const keep = Math.round(count * (1 - easeInOut(progress)));
        if (keep) paint(ctx, line.samples, 0, keep * 3);
        backing = progress < 1 ? requestAnimationFrame(frame) : 0;
      };
      backing = requestAnimationFrame(frame);
    }, { signal });

    clear?.addEventListener('click', () => {
      if (stroke || !root.classList.contains('is-filled')) return;
      settle();
      dropInk();
      dropName();
      live.textContent = word('cleared');
      sync();
      output();
    }, { signal });

    // Typing: a key first settles a sweep still running; a name wipes the ink away
    type.addEventListener('beforeinput', settle, { signal });
    type.addEventListener('input', () => {
      if (type.value.trim()) dropInk();
      sync();
      output();
    }, { signal });
    type.addEventListener('focus', () => sync(), { signal });
    type.addEventListener('blur', () => sync(), { signal });
    // Sent empty: the message goes under the box, and the focus to the field when it is the
    // first one the form stops on
    type.addEventListener('invalid', (event) => {
      event.preventDefault();
      say(word('required'));
      const firstInvalid = type.form && [...type.form.elements].find((el) => el.willValidate && !el.validity.valid);
      if (!type.form || firstInvalid === type) type.focus();
    }, { signal });
    // A form reset empties the field after this event: the pad follows on the next turn
    type.form?.addEventListener('reset', () => setTimeout(() => {
      if (signal.aborted) return;
      settle();
      stopBacking();
      strokes = [];
      redraw();
      clearError();
      sync();
      output();
    }), { signal });

    const observer = new ResizeObserver(size);
    observer.observe(canvas);
    signal.addEventListener('abort', () => {
      observer.disconnect();
      cancelAnimationFrame(backing);
      wipes.forEach(({ anim }) => anim.cancel());
      wipes.clear();
    });

    size();
    sync(false);
  }

  // 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. Each running root
  // keeps its markup as written under KODZA, shared by every Kodza script on the page: a Kodza
  // component inside another one is saved as written, not half-started, and stopped with it. Two
  // components on one root (a reveal on a stat card) both start, and stop together.
  const KODZA = Symbol.for('kodza');
  const RUNNING = Symbol.for(`kodza ${SELECTOR}`); // a root this component runs on, for every copy of this script
  const instances = new WeakMap();
  const find = (scope = document) => [scope, ...scope.querySelectorAll(SELECTOR)].filter((el) => el.matches?.(SELECTOR));
  const attrsOf = (el) => [...el.attributes].map((a) => [a.name, a.value]);
  const put = (el, saved) => {
    [...el.attributes].forEach((a) => el.removeAttribute(a.name));
    saved.attrs.forEach(([name, value]) => el.setAttribute(name, value));
    el.innerHTML = saved.html;
  };
  // The markup inside a root as written: Kodza components already running in it give back their own
  const written = (root) => {
    const all = [...root.querySelectorAll('*')];
    if (!all.some((el) => el[KODZA])) return root.innerHTML;
    const copy = root.cloneNode(true);
    const twins = copy.querySelectorAll('*');
    let last = null;
    all.forEach((el, i) => {
      if (!el[KODZA] || last?.contains(el)) return;
      last = el;
      put(twins[i], el[KODZA]);
    });
    return copy.innerHTML;
  };
  const init = (scope) => find(scope).forEach((root) => {
    // Already running, maybe from another copy of this script. Marked is-ready with no Kodza component
    // running on it, a root is a copy of a started one (a cloned slide): it is left as it is
    if (root[RUNNING] || (root.classList.contains('is-ready') && !root[KODZA])) return;
    // Rendered by React (data-kodza-manual): React starts it, with an init aimed at that markup once
    // it has hydrated it. Any earlier start would change markup React has not taken over yet
    const owner = root.closest('[data-kodza-manual]');
    if (owner && !(scope && owner.contains(scope))) return;
    const controller = new AbortController();
    // Another Kodza component already running on this root: its markup as written is kept, and the
    // two stop together
    const before = root[KODZA];
    const saved = { html: before ? before.html : written(root), attrs: before ? before.attrs : attrsOf(root), stop: () => destroy(root) };
    if (before) before.above = saved;
    instances.set(root, { controller, saved, before });
    root[KODZA] = saved;
    root[RUNNING] = true;
    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.saved.above?.stop(); // a Kodza component started after it on the same root stops first
    // The Kodza components running inside it stop first: once its markup is put back, their own
    // script could not find them any more
    root.querySelectorAll('*').forEach((el) => el[KODZA]?.stop());
    instance.controller.abort();
    delete root[RUNNING];
    // Started on top of another one: that one stops next, and puts the markup back
    if (instance.before) {
      delete instance.before.above;
      root[KODZA] = instance.before;
      return instance.before.stop();
    }
    delete root[KODZA];
    put(root, instance.saved);
  });
  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).