# Trapdoor Menu

> Press Menu and the page swings down on its hinge like a trapdoor, showing the menu underneath: links rise as the edge passes them, an image follows your pointer. Closing replays it backwards. No GSAP.

Navigation · menu, fullscreen, 3d, nav, dialog · HTML, CSS, vanilla JS · no dependencies · updated 2026-10-21
Demo: https://kodza.dev/components/trapdoor-menu/

Takes the whole screen (or reacts to the page scroll): give it a page, not a small box.

## Files

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

- [`kodza-trapdoor-menu.css`](https://kodza.dev/registry/trapdoor-menu/kodza-trapdoor-menu.css) · 19.0 KB
- [`kodza-trapdoor-menu.js`](https://kodza.dev/registry/trapdoor-menu/kodza-trapdoor-menu.js) · 27.4 KB
- [`kodza-trapdoor-menu.html`](https://kodza.dev/registry/trapdoor-menu/kodza-trapdoor-menu.html) · 3.2 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-trapdoor-menu.css https://kodza.dev/registry/trapdoor-menu/kodza-trapdoor-menu.css
curl -fsSL --create-dirs -o kodza/kodza-trapdoor-menu.js https://kodza.dev/registry/trapdoor-menu/kodza-trapdoor-menu.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-trapdoor`
- Variables (set them on the root element itself: it declares its own defaults):
  - `--kz-trapdoor-bg: #0a0a0a` — the menu, under the page
  - `--kz-trapdoor-fg: #f2f2f0`
  - `--kz-trapdoor-muted: rgba(242, 242, 240, 0.62)`
  - `--kz-trapdoor-line: rgba(242, 242, 240, 0.16)`
  - `--kz-trapdoor-ink: #0a0a0a` — the Menu button, on the page
  - `--kz-trapdoor-on-ink: #ffffff`
  - `--kz-trapdoor-page: auto` — the page colour while it tips; auto = the first background above it
  - `--kz-trapdoor-top: calc(var(--wp-admin--admin-bar--height, 0px) + 20px)` — match your header, so Close lands right where Menu was (below the WordPress admin bar)
  - `--kz-trapdoor-side: 24px`
  - `--kz-trapdoor-size: clamp(28px, min(7.4cqw, calc(16cqh - 46px)), 104px)`
  - `--kz-trapdoor-angle: 84deg` — how far the page tips back
  - `--kz-trapdoor-shade: 0.6` — how dark it gets on the way down
  - `--kz-trapdoor-duration: 1.1s`
  - `--kz-trapdoor-ease: cubic-bezier(0.76, 0, 0.24, 1)`
- Attributes:
  - `data-page`
- 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 button (focus in `.kodza-trapdoor__toggle`):
  - `Enter` / `Space`: Opens it on the current link, or the first
- In the menu (focus in `.kodza-trapdoor__panel`):
  - `ArrowDown` / `ArrowUp`: Next or previous link, round and round
  - `Home` / `End`: First or last link
  - `Tab` / `Shift+Tab`: Stays inside the menu, round and round
  - `PageUp` / `PageDown`: Held back, the page behind stays put
- Anywhere, while it's open (while `.kodza-trapdoor__toggle[aria-expanded="true"]` is on the page):
  - `Escape`: Puts the page back, focus back on Menu

## 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-trapdoor {
    --kz-trapdoor-bg: #f2f2f0;
    --kz-trapdoor-fg: #0a0a0a;
    --kz-trapdoor-muted: rgba(10, 10, 10, 0.62);
    --kz-trapdoor-line: rgba(10, 10, 10, 0.14);
    --kz-trapdoor-ink: #f2f2f0;
    --kz-trapdoor-on-ink: #0a0a0a;
  }
}
```

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

Its images have dark versions next to them (`kz-columns-1400.webp` → `kz-columns-dark-1400.webp`). To swap them on a dark page: `<picture><source media="(prefers-color-scheme: dark)" srcset="…-dark-….webp"><img …></picture>`.

## Use it

### Plain HTML page

- CSS: `kodza/kodza-trapdoor-menu.css` next to the page (the Files commands as they are), linked in `<head>`: `<link rel="stylesheet" href="kodza/kodza-trapdoor-menu.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-trapdoor-menu.js`, loaded with `<script src="kodza/kodza-trapdoor-menu.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$/{r kodza/kodza-trapdoor-menu.css' -e 'd' -e '}' -e '/^KODZA-JS$/{r kodza/kodza-trapdoor-menu.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">`.
- Images: the artifact blocks every other host, `kodza.dev` included, without an error. Embed each one as a `data:` URI, with a command if you can run one (`curl -s <url> | base64`; the 1400 px files weigh 10 to 30 KB), never by typing base64 out. If you can't run commands, keep the `<img>` with its `width` and `height`, and tell the user the picture stays blank inside the artifact.
- 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-trapdoor-menu', $uri . 'kodza-trapdoor-menu.css', [], filemtime($dir . 'kodza-trapdoor-menu.css'));
    wp_enqueue_script('kodza-trapdoor-menu', $uri . 'kodza-trapdoor-menu.js', [], filemtime($dir . 'kodza-trapdoor-menu.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-trapdoor { --kz-trapdoor-ink: var(ACCENT, #0a0a0a); --kz-trapdoor-on-ink: 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>`).
- Put it in the site header (Site Editor → Patterns → Header) or anywhere in the page. The page that tips is found on its own in block themes and in Astra, GeneratePress, Kadence, OceanWP, Blocksy or Divi; for another wrapper, name it on the menu with data-page=".site". With no wrapper at all (Hello Elementor), the menu opens over the page. A fixed theme header rides along and is put back afterwards; Close stays below the admin bar.

#### 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. This one reads the page around it, and a script in the widget runs before the rest of the page exists: put its `<script>` in an HTML widget at the bottom of the page instead.

### Shopify

- Files: `assets/kodza-trapdoor-menu.css` and `assets/kodza-trapdoor-menu.js` (the Files commands with `-o assets/…`).
- In the section: `{{ 'kodza-trapdoor-menu.css' | asset_url | stylesheet_tag }}` and `<script src="{{ 'kodza-trapdoor-menu.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/`): `TrapdoorMenu.tsx` (below), the CSS block under Code saved as `trapdoor-menu.css` and the JS block as `trapdoor-menu.js`, both as they are. The HTML block is already inside the component: skip it.
- Use it: `import { TrapdoorMenu } from '@/components/kodza/TrapdoorMenu';` then `<TrapdoorMenu />`. Props: `vars` (the `--kz-…` variables listed under API, e.g. `vars={{ '--kz-trapdoor-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 './trapdoor-menu.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 — Trapdoor Menu, for React. From https://kodza.dev/components/trapdoor-menu/
// 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: trapdoor-menu.css and trapdoor-menu.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 './trapdoor-menu.css';

export type TrapdoorMenuProps = Omit<ComponentPropsWithoutRef<'div'>, "children" | "vars"> & {
  /** Settings, as CSS variables on the root */
  vars?: {
    /** the menu, under the page — default: #0a0a0a */
    "--kz-trapdoor-bg"?: string | number;
    /** default: #f2f2f0 */
    "--kz-trapdoor-fg"?: string | number;
    /** default: rgba(242, 242, 240, 0.62) */
    "--kz-trapdoor-muted"?: string | number;
    /** default: rgba(242, 242, 240, 0.16) */
    "--kz-trapdoor-line"?: string | number;
    /** the Menu button, on the page — default: #0a0a0a */
    "--kz-trapdoor-ink"?: string | number;
    /** default: #ffffff */
    "--kz-trapdoor-on-ink"?: string | number;
    /** the page colour while it tips; auto = the first background above it — default: auto */
    "--kz-trapdoor-page"?: string | number;
    /** match your header, so Close lands right where Menu was (below the WordPress admin bar) — default: calc(var(--wp-admin--admin-bar--height, 0px) + 20px) */
    "--kz-trapdoor-top"?: string | number;
    /** default: 24px */
    "--kz-trapdoor-side"?: string | number;
    /** default: clamp(28px, min(7.4cqw, calc(16cqh - 46px)), 104px) */
    "--kz-trapdoor-size"?: string | number;
    /** how far the page tips back — default: 84deg */
    "--kz-trapdoor-angle"?: string | number;
    /** how dark it gets on the way down — default: 0.6 */
    "--kz-trapdoor-shade"?: string | number;
    /** default: 1.1s */
    "--kz-trapdoor-duration"?: string | number;
    /** default: cubic-bezier(0.76, 0, 0.24, 1) */
    "--kz-trapdoor-ease"?: string | number;
  };
  className?: string;
};

export function TrapdoorMenu({ vars, className, style, ...rest }: TrapdoorMenuProps) {
  const ref = useRef<ComponentRef<'div'>>(null);
  const classes = ["kodza-trapdoor", 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('./trapdoor-menu.js').then(() => {
      if (live) document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root } }));
    });
    return () => {
      live = false;
      document.dispatchEvent(new CustomEvent('kodza:destroy', { detail: { root } }));
    };
  }, [key]);

  return (
    <div key={key} {...rest} className={classes} style={{ ...vars, ...style } as CSSProperties} ref={ref}>
      <button className="kodza-trapdoor__toggle" type="button" aria-haspopup="dialog" aria-expanded="false"><span className="kodza-trapdoor__lines" aria-hidden="true" />Menu</button>
      <div className="kodza-trapdoor__panel" role="dialog" aria-modal="true" aria-label="Menu" tabIndex={-1} hidden>
        <div className="kodza-trapdoor__bar">
          <p className="kodza-trapdoor__label">5 doors, no stairs</p>
          <button className="kodza-trapdoor__close" type="button"><span className="kodza-trapdoor__cross" aria-hidden="true" />Close</button>
        </div>
        <div className="kodza-trapdoor__stage">
          <nav className="kodza-trapdoor__nav" aria-label="Main">
            <a className="kodza-trapdoor__link" href="#">
              <span className="kodza-trapdoor__index">01</span>
              <span className="kodza-trapdoor__mask">
                <span className="kodza-trapdoor__word">Work</span>
              </span>
              <span className="kodza-trapdoor__meta">12 shipped</span>
            </a>
            {' '}
            <a className="kodza-trapdoor__link" href="#">
              <span className="kodza-trapdoor__index">02</span>
              <span className="kodza-trapdoor__mask">
                <span className="kodza-trapdoor__word">Studio</span>
              </span>
              <span className="kodza-trapdoor__meta">est. 2019</span>
            </a>
            {' '}
            <a className="kodza-trapdoor__link" href="#">
              <span className="kodza-trapdoor__index">03</span>
              <span className="kodza-trapdoor__mask">
                <span className="kodza-trapdoor__word">Journal</span>
              </span>
              <span className="kodza-trapdoor__meta">weekly-ish</span>
            </a>
            {' '}
            <a className="kodza-trapdoor__link" href="#">
              <span className="kodza-trapdoor__index">04</span>
              <span className="kodza-trapdoor__mask">
                <span className="kodza-trapdoor__word">Lab</span>
              </span>
              <span className="kodza-trapdoor__meta">may break</span>
            </a>
            {' '}
            <a className="kodza-trapdoor__link" href="#">
              <span className="kodza-trapdoor__index">05</span>
              <span className="kodza-trapdoor__mask">
                <span className="kodza-trapdoor__word">Contact</span>
              </span>
              <span className="kodza-trapdoor__meta">replies in a day</span>
            </a>
          </nav>
          <div className="kodza-trapdoor__media" aria-hidden="true">
            <div className="kodza-trapdoor__figure">
              <div className="kodza-trapdoor__frame">
                <img className="kodza-trapdoor__image" src="https://kodza.dev/media/kz-columns-1400.webp" alt="" width="1120" height="1400" decoding="async" />
                {' '}
                <img className="kodza-trapdoor__image" src="https://kodza.dev/media/kz-block-1400.webp" alt="" width="1120" height="1400" decoding="async" />
                {' '}
                <img className="kodza-trapdoor__image" src="https://kodza.dev/media/kz-stack-1400.webp" alt="" width="1400" height="1050" decoding="async" />
                {' '}
                <img className="kodza-trapdoor__image" src="https://kodza.dev/media/kz-float-1400.webp" alt="" width="1400" height="933" decoding="async" />
                {' '}
                <img className="kodza-trapdoor__image" src="https://kodza.dev/media/kz-steps-1400.webp" alt="" width="1400" height="933" decoding="async" />
              </div>
              <p className="kodza-trapdoor__caption">
                <span>display: grid</span>
                <span>display: block</span>
                <span>z-index: 9999</span>
                <span>float: left</span>
                <span>steps(5, end)</span>
              </p>
            </div>
          </div>
          <div className="kodza-trapdoor__info">
            <p>Open for new work · Q1 2027</p>
            <p className="kodza-trapdoor__socials">
              <a href="#">GitHub</a>
              <a href="#">X</a>
              <a href="#">RSS</a>
            </p>
            <p className="kodza-trapdoor__hint">Esc puts the floor back.</p>
          </div>
        </div>
      </div>
    </div>
  );
}
```

## Code

```html
<div class="kodza-trapdoor">
  <button class="kodza-trapdoor__toggle" type="button" aria-haspopup="dialog" aria-expanded="false"><span class="kodza-trapdoor__lines" aria-hidden="true"></span>Menu</button>
  <div class="kodza-trapdoor__panel" role="dialog" aria-modal="true" aria-label="Menu" tabindex="-1" hidden>
    <div class="kodza-trapdoor__bar">
      <p class="kodza-trapdoor__label">5 doors, no stairs</p>
      <button class="kodza-trapdoor__close" type="button"><span class="kodza-trapdoor__cross" aria-hidden="true"></span>Close</button>
    </div>
    <div class="kodza-trapdoor__stage">
      <nav class="kodza-trapdoor__nav" aria-label="Main">
        <a class="kodza-trapdoor__link" href="#"><span class="kodza-trapdoor__index">01</span><span class="kodza-trapdoor__mask"><span class="kodza-trapdoor__word">Work</span></span><span class="kodza-trapdoor__meta">12 shipped</span></a>
        <a class="kodza-trapdoor__link" href="#"><span class="kodza-trapdoor__index">02</span><span class="kodza-trapdoor__mask"><span class="kodza-trapdoor__word">Studio</span></span><span class="kodza-trapdoor__meta">est. 2019</span></a>
        <a class="kodza-trapdoor__link" href="#"><span class="kodza-trapdoor__index">03</span><span class="kodza-trapdoor__mask"><span class="kodza-trapdoor__word">Journal</span></span><span class="kodza-trapdoor__meta">weekly-ish</span></a>
        <a class="kodza-trapdoor__link" href="#"><span class="kodza-trapdoor__index">04</span><span class="kodza-trapdoor__mask"><span class="kodza-trapdoor__word">Lab</span></span><span class="kodza-trapdoor__meta">may break</span></a>
        <a class="kodza-trapdoor__link" href="#"><span class="kodza-trapdoor__index">05</span><span class="kodza-trapdoor__mask"><span class="kodza-trapdoor__word">Contact</span></span><span class="kodza-trapdoor__meta">replies in a day</span></a>
      </nav>
      <div class="kodza-trapdoor__media" aria-hidden="true">
        <div class="kodza-trapdoor__figure">
          <div class="kodza-trapdoor__frame">
            <img class="kodza-trapdoor__image" src="https://kodza.dev/media/kz-columns-1400.webp" alt="" width="1120" height="1400" decoding="async">
            <img class="kodza-trapdoor__image" src="https://kodza.dev/media/kz-block-1400.webp" alt="" width="1120" height="1400" decoding="async">
            <img class="kodza-trapdoor__image" src="https://kodza.dev/media/kz-stack-1400.webp" alt="" width="1400" height="1050" decoding="async">
            <img class="kodza-trapdoor__image" src="https://kodza.dev/media/kz-float-1400.webp" alt="" width="1400" height="933" decoding="async">
            <img class="kodza-trapdoor__image" src="https://kodza.dev/media/kz-steps-1400.webp" alt="" width="1400" height="933" decoding="async">
          </div>
          <p class="kodza-trapdoor__caption"><span>display: grid</span><span>display: block</span><span>z-index: 9999</span><span>float: left</span><span>steps(5, end)</span></p>
        </div>
      </div>
      <div class="kodza-trapdoor__info">
        <p>Open for new work · Q1 2027</p>
        <p class="kodza-trapdoor__socials"><a href="#">GitHub</a><a href="#">X</a><a href="#">RSS</a></p>
        <p class="kodza-trapdoor__hint">Esc puts the floor back.</p>
      </div>
    </div>
  </div>
</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 — Trapdoor Menu
   The page tips back on its bottom edge like a trapdoor and shows the menu underneath: the rows
   draw in, the links rise from their masks as the edge uncovers them, the image follows the link
   you point at, then the small print. Closing plays it all backwards.
   Mark the wrapper of your site with data-trapdoor-page, or name it on the menu with
   data-page="…" (the wrapper of most WordPress themes is found on its own).
   Everything is tuned with the --kz-trapdoor-* variables. */
.kodza-trapdoor {
  --kz-trapdoor-bg: #0a0a0a; /* the menu, under the page */
  --kz-trapdoor-fg: #f2f2f0;
  --kz-trapdoor-muted: rgba(242, 242, 240, 0.62);
  --kz-trapdoor-line: rgba(242, 242, 240, 0.16);
  --kz-trapdoor-ink: #0a0a0a; /* the Menu button, on the page */
  --kz-trapdoor-on-ink: #ffffff;
  --kz-trapdoor-page: auto; /* the page colour while it tips; auto = the first background above it */
  --kz-trapdoor-top: calc(var(--wp-admin--admin-bar--height, 0px) + 20px); /* match your header, so Close lands right where Menu was (below the WordPress admin bar) */
  --kz-trapdoor-side: 24px;
  --kz-trapdoor-size: clamp(28px, min(7.4cqw, calc(16cqh - 46px)), 104px);
  --kz-trapdoor-angle: 84deg; /* how far the page tips back */
  --kz-trapdoor-shade: 0.6; /* how dark it gets on the way down */
  --kz-trapdoor-duration: 1.1s;
  --kz-trapdoor-ease: cubic-bezier(0.76, 0, 0.24, 1);

  display: inline-block;
}

.kodza-trapdoor__toggle,
.kodza-trapdoor__close {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 40px;
  margin: 0;
  padding: 0 18px 0 16px;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.01em;
  white-space: nowrap;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.kodza-trapdoor__toggle {
  background: var(--kz-trapdoor-ink);
  color: var(--kz-trapdoor-on-ink);
}

.kodza-trapdoor__close {
  background: var(--kz-trapdoor-fg);
  color: var(--kz-trapdoor-bg);
}

.kodza-trapdoor__toggle:focus-visible {
  outline: 2px solid var(--kz-trapdoor-ink);
  outline-offset: 3px;
}

.kodza-trapdoor__close:focus-visible,
.kodza-trapdoor__link:focus-visible,
.kodza-trapdoor__socials a:focus-visible {
  outline: 2px solid var(--kz-trapdoor-fg);
  outline-offset: 4px;
}

/* Two lines on the button; under the page, the same two lines are crossed */
.kodza-trapdoor__lines,
.kodza-trapdoor__cross {
  position: relative;
  flex: none;
  width: 14px;
  height: 8px;
}

.kodza-trapdoor__lines::before,
.kodza-trapdoor__lines::after,
.kodza-trapdoor__cross::before,
.kodza-trapdoor__cross::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  border-radius: 1px;
  background: currentColor;
}

.kodza-trapdoor__lines::before,
.kodza-trapdoor__cross::before {
  top: 0;
}

.kodza-trapdoor__lines::after,
.kodza-trapdoor__cross::after {
  top: 6.5px;
}

.kodza-trapdoor__lines::after {
  transform-origin: left center;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.kodza-trapdoor__toggle:hover .kodza-trapdoor__lines::after {
  transform: scaleX(0.55);
}

.kodza-trapdoor__cross::before {
  transform: translateY(3.25px) rotate(45deg);
}

.kodza-trapdoor__cross::after {
  transform: translateY(-3.25px) rotate(-45deg);
}

/* The menu: fixed over the whole screen. While it is open it sits right under the page */
.kodza-trapdoor__panel {
  position: fixed;
  inset: 0;
  z-index: 0;
  display: grid;
  grid-template-rows: auto 1fr;
  box-sizing: border-box;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: 0;
  border: 0;
  overflow: hidden auto;
  overscroll-behavior: contain;
  background: var(--kz-trapdoor-bg);
  color: var(--kz-trapdoor-fg);
  font: inherit;
  font-size: 15px;
  line-height: 1.4;
  text-align: left;
  container-type: size;
  -webkit-font-smoothing: antialiased;
}

.kodza-trapdoor__panel[hidden] {
  display: none;
}

.kodza-trapdoor__panel:focus {
  outline: none;
}

.kodza-trapdoor__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: var(--kz-trapdoor-top) var(--kz-trapdoor-side) 0;
}

.kodza-trapdoor__label,
.kodza-trapdoor__index,
.kodza-trapdoor__meta,
.kodza-trapdoor__caption,
.kodza-trapdoor__info {
  font-family: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0;
  color: var(--kz-trapdoor-muted);
}

.kodza-trapdoor__label {
  margin: 0;
}

/* Links on the left, the image that follows them on the right, the small print below.
   The bottom padding keeps clear of the page lying folded at the bottom of the screen */
.kodza-trapdoor__stage {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(170px, 23cqw, 320px);
  grid-template-rows: 1fr auto;
  gap: clamp(12px, 3cqh, 24px) clamp(32px, 7cqw, 120px);
  box-sizing: border-box;
  padding: clamp(12px, 3cqh, 40px) var(--kz-trapdoor-side) calc(var(--kz-trapdoor-fold, 0px) + 20px);
}

.kodza-trapdoor__nav {
  position: relative;
  align-self: center;
  display: flex;
  flex-direction: column;
}

.kodza-trapdoor__link {
  position: relative;
  display: grid;
  grid-template-columns: 3ch max-content minmax(0, 1fr);
  align-items: end;
  column-gap: clamp(12px, 2cqw, 28px);
  padding: clamp(5px, 1.1cqh, 9px) 0 clamp(4px, 0.9cqh, 7px);
  border-radius: 4px;
  color: inherit;
  text-decoration: none;
}

/* The row's hairline, drawn from the left as the row arrives */
.kodza-trapdoor__link::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 1px;
  background: var(--kz-trapdoor-line);
  transform-origin: left center;
}

.kodza-trapdoor__index {
  align-self: start;
  padding-top: 4px;
  transition: color 0.3s ease;
}

/* The word rises from behind this mask (room below for descenders, on the right for the nudge) */
.kodza-trapdoor__mask {
  display: block;
  overflow: hidden;
  padding: 0.08em 0.16em 0.26em 0;
  margin: -0.08em -0.16em -0.26em 0;
  font-size: var(--kz-trapdoor-size); /* so these em are the word's */
}

.kodza-trapdoor__word {
  display: block;
  font-size: var(--kz-trapdoor-size);
  font-weight: 500;
  line-height: 0.95;
  letter-spacing: -0.045em;
  white-space: nowrap;
  transition: translate 0.6s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.35s ease;
}

/* The word keeps its width; the note takes what is left and wraps on a small phone */
.kodza-trapdoor__meta {
  padding-bottom: 0.45em;
  text-align: right;
  text-wrap: balance;
}

/* Pointing at a link: the others step back, the image moves next to it */
.kodza-trapdoor__nav:hover .kodza-trapdoor__link:not(.is-active) .kodza-trapdoor__word,
.kodza-trapdoor__nav:has(:focus-visible) .kodza-trapdoor__link:not(.is-active) .kodza-trapdoor__word {
  opacity: 0.4;
}

.kodza-trapdoor__nav:hover .kodza-trapdoor__link.is-active .kodza-trapdoor__word,
.kodza-trapdoor__nav:has(:focus-visible) .kodza-trapdoor__link.is-active .kodza-trapdoor__word {
  translate: 0.1em 0;
}

.kodza-trapdoor__link.is-active .kodza-trapdoor__index {
  color: var(--kz-trapdoor-fg);
}

.kodza-trapdoor__media {
  position: relative;
}

.kodza-trapdoor__figure {
  position: absolute;
  top: 0;
  right: 0;
  width: min(100%, calc((100cqh - 220px) * 0.62));
  margin: 0;
  translate: 0 var(--kz-trapdoor-y, 0px);
  transition: translate 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.kodza-trapdoor__figure.is-placing {
  transition: none;
}

.kodza-trapdoor__frame {
  position: relative;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  border-radius: 14px;
  background: var(--kz-trapdoor-line);
}

.kodza-trapdoor__image {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  visibility: hidden;
}

.kodza-trapdoor__image.is-shown {
  visibility: visible;
}

/* One caption per image, stacked; the new one rolls in as the old one rolls out */
.kodza-trapdoor__caption {
  display: grid;
  margin: 12px 0 0;
  overflow: hidden;
}

.kodza-trapdoor__caption span {
  grid-area: 1 / 1;
  transform: translateY(110%);
}

.kodza-trapdoor__info {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
}

.kodza-trapdoor__info p {
  margin: 0;
}

.kodza-trapdoor__socials {
  display: flex;
  gap: 16px;
}

.kodza-trapdoor__socials a {
  border-radius: 3px;
  color: var(--kz-trapdoor-fg);
  text-decoration: none;
}

.kodza-trapdoor__socials a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Phones: one column, no image (nothing to point at), no keyboard hint */
@container (max-width: 720px) {
  .kodza-trapdoor__stage {
    --kz-trapdoor-size: clamp(30px, min(11.5cqw, calc(16cqh - 46px)), 60px);
    grid-template-columns: minmax(0, 1fr);
  }

  .kodza-trapdoor__media {
    display: none;
  }

  .kodza-trapdoor__hint {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .kodza-trapdoor__lines::after,
  .kodza-trapdoor__link,
  .kodza-trapdoor__index,
  .kodza-trapdoor__word,
  .kodza-trapdoor__figure {
    transition-duration: 0.01ms !important;
  }
}

/* Theming example — on a dark site, the menu turns to paper:
.dark-site .kodza-trapdoor {
  --kz-trapdoor-bg: #f2f2f0;
  --kz-trapdoor-fg: #0a0a0a;
  --kz-trapdoor-muted: rgba(10, 10, 10, 0.62);
  --kz-trapdoor-line: rgba(10, 10, 10, 0.14);
  --kz-trapdoor-ink: #f2f2f0;
  --kz-trapdoor-on-ink: #0a0a0a;
}
*/

/* kodza-guard 1f00a804f389 — 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-trapdoor__toggle):not(#_),
:where(.kodza-trapdoor__close):not(#_) {
  outline: revert;
  outline-offset: revert;
}

:where(.kodza-trapdoor__panel):not(#_) {
  outline: revert;
}

:where(.kodza-trapdoor__link):not(#_) {
  outline: revert;
  outline-offset: revert;
  transition-duration: revert;
}

:where(.kodza-trapdoor__socials a:where(:not([class*="kodza-"]))):not(#_) {
  outline: revert;
  outline-offset: revert;
  text-underline-offset: revert;
}

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

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

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

.kodza-trapdoor:not(#_),
.kodza-trapdoor__lines:not(#_),
.kodza-trapdoor__bar:not(#_),
.kodza-trapdoor__cross:not(#_),
.kodza-trapdoor__index:not(#_),
.kodza-trapdoor__mask:not(#_),
.kodza-trapdoor__word:not(#_),
.kodza-trapdoor__meta:not(#_),
.kodza-trapdoor__media:not(#_),
.kodza-trapdoor__figure:not(#_),
.kodza-trapdoor__frame:not(#_),
.kodza-trapdoor__info:not(#_),
.kodza-trapdoor__caption span:where(:not([class*="kodza-"])):not(#_) {
  box-sizing: revert;
}

.kodza-trapdoor__toggle:not(#_),
.kodza-trapdoor__close:not(#_) {
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  box-shadow: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
  min-height: revert;
}

.kodza-trapdoor__panel:not(#_) {
  box-shadow: revert;
  outline-offset: revert;
}

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

.kodza-trapdoor__nav: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;
  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-trapdoor__link:not(#_) {
  border: revert;
  margin: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  appearance: revert;
  max-width: revert;
  max-height: 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;
  transition-property: revert;
  transition-timing-function: revert;
  transition-delay: revert;
}

.kodza-trapdoor__image: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;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: 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-trapdoor__socials:not(#_),
.kodza-trapdoor__hint:not(#_),
.kodza-trapdoor__info p:where(:not([class*="kodza-"]):not(.kodza-trapdoor__info [class*="kodza-"] *)):not(#_) {
  border: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-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-trapdoor__socials a:where(:not([class*="kodza-"])):not(#_) {
  border: revert;
  margin: revert;
  padding: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  font-family: revert;
  font-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-trapdoor__label:not(#_):where(:not([hidden])),
.kodza-trapdoor__info p:where(:not([class*="kodza-"]):not(.kodza-trapdoor__info [class*="kodza-"] *)):not(#_):where(:not([hidden])),
.kodza-trapdoor__socials a:where(:not([class*="kodza-"])):not(#_):where(:not([hidden])) {
  display: revert;
}

.kodza-trapdoor__label:not(#_):where([hidden]),
.kodza-trapdoor__info p:where(:not([class*="kodza-"]):not(.kodza-trapdoor__info [class*="kodza-"] *)):not(#_):where([hidden]),
.kodza-trapdoor__socials a:where(:not([class*="kodza-"])):not(#_):where([hidden]) {
  display: none;
}

.kodza-trapdoor__lines:not(#_)::before,
.kodza-trapdoor__lines:not(#_)::after,
.kodza-trapdoor__cross:not(#_)::before,
.kodza-trapdoor__cross:not(#_)::after,
.kodza-trapdoor__link: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-trapdoor__toggle:not(#_),
.kodza-trapdoor__close:not(#_) {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 40px;
  margin: 0;
  padding: 0 18px 0 16px;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.01em;
  white-space: nowrap;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.kodza-trapdoor__toggle:not(#_) {
  background: var(--kz-trapdoor-ink);
  color: var(--kz-trapdoor-on-ink);
}

.kodza-trapdoor__close:not(#_) {
  background: var(--kz-trapdoor-fg);
  color: var(--kz-trapdoor-bg);
}

.kodza-trapdoor__toggle:focus-visible:not(#_) {
  outline: 2px solid var(--kz-trapdoor-ink);
  outline-offset: 3px;
}

.kodza-trapdoor__close:focus-visible:not(#_) {
  outline: 2px solid var(--kz-trapdoor-fg);
  outline-offset: 4px;
}

.kodza-trapdoor__link:focus-visible:not(#_),
.kodza-trapdoor__socials a:focus-visible:not(#_) {
  outline: 2px solid var(--kz-trapdoor-fg);
  outline-offset: 4px;
}

.kodza-trapdoor__panel:focus:not(#_) {
  outline: none;
}

.kodza-trapdoor__label:not(#_),
.kodza-trapdoor__caption:not(#_) {
  font-family: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0;
  color: var(--kz-trapdoor-muted);
}

.kodza-trapdoor__label:not(#_) {
  margin: 0;
}

.kodza-trapdoor__nav:not(#_) {
  position: relative;
  display: flex;
}

.kodza-trapdoor__link:not(#_) {
  position: relative;
  display: grid;
  padding: clamp(5px, 1.1cqh, 9px) 0 clamp(4px, 0.9cqh, 7px);
  border-radius: 4px;
  color: inherit;
  text-decoration: none;
}

.kodza-trapdoor__image:not(#_) {
  position: absolute;
  display: block;
  max-width: 100%;
}

.kodza-trapdoor__caption:not(#_) {
  display: grid;
  margin: 12px 0 0;
}

.kodza-trapdoor__info p:not(#_) {
  margin: 0;
}

.kodza-trapdoor__socials:not(#_) {
  display: flex;
}

.kodza-trapdoor__socials a:not(#_) {
  border-radius: 3px;
  color: var(--kz-trapdoor-fg);
  text-decoration: none;
}

.kodza-trapdoor__socials a:hover:not(#_) {
  text-decoration: underline;
  text-underline-offset: 3px;
}

@container (max-width: 720px) {
  .kodza-trapdoor__hint:not(#_) {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .kodza-trapdoor__link:not(#_) {
    transition-duration: 0.01ms !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 — Trapdoor Menu
// The page marked with data-trapdoor-page tips back on its bottom edge like a trapdoor and shows
// the menu underneath. Each link rises from its mask as the edge uncovers it, the image follows
// the link you point at, and closing plays the same timeline backwards, from wherever it is.
// The page only carries a transform while the menu is open: its fixed elements (a theme's
// header) ride along with it, and everything is put back once it is down again.
(() => {
  const SELECTOR = '.kodza-trapdoor';
  const motion = window.matchMedia('(prefers-reduced-motion: reduce)');
  const RISE = 'cubic-bezier(0.22, 1, 0.36, 1)';
  const SWING = 'cubic-bezier(0.65, 0, 0.35, 1)';
  const BACK = 1.6; // closing replays the opening backwards, this much faster
  // While open the panel leaves the menu (under the page, out of the content): it takes these along
  const VARS = ['bg', 'fg', 'muted', 'line', 'top', 'side', 'size'];
  const FOCUSABLE = 'a[href], button:not([disabled]), input, select, textarea, [tabindex]:not([tabindex="-1"])';
  const tilted = new WeakMap(); // page → how to put it down at once (one menu tilts a page at a time)

  const transparent = (color) => !color || color === 'transparent' || /^rgba\(.*,\s*0\)$/.test(color);

  // [time, progress] pairs along a cubic-bezier(): when does the edge pass a given row?
  const curve = (easing) => {
    const n = (easing.match(/-?\d*\.?\d+/g) || []).map(Number);
    const [x1, y1, x2, y2] = n.length === 4 ? n : [0.76, 0, 0.24, 1];
    const at = (s, a, b) => 3 * (1 - s) * (1 - s) * s * a + 3 * (1 - s) * s * s * b + s * s * s;
    return Array.from({ length: 101 }, (_, i) => [at(i / 100, x1, x2), at(i / 100, y1, y2)]);
  };

  // A transform makes the page the containing block of its fixed elements: they are found
  // first, then moved back to where they were on screen (see `rideAlong`)
  const fixedInside = (page) => {
    const found = [];
    const walker = document.createTreeWalker(page, NodeFilter.SHOW_ELEMENT, {
      acceptNode: (el) => {
        const style = getComputedStyle(el);
        if (style.display === 'none') return NodeFilter.FILTER_REJECT;
        if (style.position !== 'fixed') return NodeFilter.FILTER_SKIP;
        found.push({ el, box: el.getBoundingClientRect(), shift: style.translate, inline: el.style.translate, attr: el.hasAttribute('style') });
        return NodeFilter.FILTER_REJECT;
      },
    });
    while (walker.nextNode()) {
      // acceptNode collects them
    }
    return found;
  };

  const rideAlong = (fixed, k) => fixed.forEach((item) => {
    const now = item.el.getBoundingClientRect();
    const [x = 0, y = 0] = item.shift === 'none' ? [] : item.shift.split(' ').map(parseFloat);
    item.el.style.translate = `${x + (item.box.left - now.left) / k}px ${y + (item.box.top - now.top) / k}px`;
  });

  const letGo = (fixed) => fixed.forEach(({ el, inline, attr }) => {
    el.style.translate = inline;
    if (!attr && !el.getAttribute('style')) el.removeAttribute('style');
  });

  // One instance. Everything it starts is tied to `signal`, so kodza:destroy stops it all
  function mount(root, signal) {
    const toggle = root.querySelector('.kodza-trapdoor__toggle');
    const panel = root.querySelector('.kodza-trapdoor__panel');
    if (!toggle || !panel) return;
    const one = (s) => panel.querySelector(s);
    const all = (s) => [...panel.querySelectorAll(s)];
    const closer = one('.kodza-trapdoor__close');
    const cross = one('.kodza-trapdoor__cross');
    const stage = one('.kodza-trapdoor__stage');
    const nav = one('.kodza-trapdoor__nav');
    const links = all('.kodza-trapdoor__link');
    const media = one('.kodza-trapdoor__media');
    const figure = one('.kodza-trapdoor__figure');
    const frame = one('.kodza-trapdoor__frame');
    const caption = one('.kodza-trapdoor__caption');
    const images = all('.kodza-trapdoor__image');
    const captions = all('.kodza-trapdoor__caption span');
    const infos = all('.kodza-trapdoor__info > *');
    const home = [panel.parentNode, panel.nextSibling];
    const css = (name) => getComputedStyle(root).getPropertyValue(`--kz-trapdoor-${name}`).trim();

    let state = 'closed'; // closed, opening, open, closing
    let sequence = []; // the opening: animations on one clock, so it can run backwards
    let session = null; // what only lives while the menu is open
    let tilt = null; // the page being tipped, and what it looked like before
    let reduced = false;
    let active = -1;
    let layer = 1;
    let run = 0;
    let then = null;

    // The page: named on the menu (data-page="…"), or the marked wrapper around it, or else
    // the wrapper of a WordPress theme (block themes, Astra, GeneratePress, Kadence, OceanWP,
    // Blocksy, Divi…). Without one, the menu opens over the page, the same sequence minus the tilt
    const findPage = () => {
      let el = null;
      try {
        el = root.dataset.page ? document.querySelector(root.dataset.page) : null;
      } catch {
        el = null;
      }
      el = el || root.closest('[data-trapdoor-page]') || document.querySelector('[data-trapdoor-page]') || root.closest('.wp-site-blocks, #page, #outer-wrap, #main-container, #page-container');
      if (!el || el === document.body || el === document.documentElement) return null;
      // It has to fill the screen (below the WordPress admin bar): otherwise part of the site, a
      // header outside it or the space under a short page, would be left out of the tilt
      const r = el.getBoundingClientRect();
      const bar = parseFloat(getComputedStyle(document.documentElement).getPropertyValue('--wp-admin--admin-bar--height')) || 0;
      const { clientWidth: vw, clientHeight: vh } = document.documentElement;
      return r.top <= bar + 1 && r.left <= 1 && r.right >= vw - 1 && r.bottom >= vh - 1 ? el : null;
    };

    // The colour under the page's content, so the menu never shows through it
    const ground = (page) => {
      const own = css('page');
      if (own && own !== 'auto') return own;
      for (let el = page.parentElement; el; el = el.parentElement) {
        const color = getComputedStyle(el).backgroundColor;
        if (!transparent(color)) return color;
      }
      return '#ffffff';
    };

    // Where the page is on screen, in its own pixels (a scaled parent changes nothing). Only
    // the visible part tips: it is clipped to the screen, the hinge is the bottom of the screen
    const measure = (page) => {
      const r = page.getBoundingClientRect();
      const k = page.offsetWidth ? r.width / page.offsetWidth : 1;
      const top = Math.max(r.top, 0);
      const bottom = Math.min(r.bottom, document.documentElement.clientHeight);
      const left = Math.max(r.left, 0);
      const right = Math.min(r.right, document.documentElement.clientWidth);
      const h = Math.max(bottom - top, 1) / k;
      const depth = h * 1.5;
      const lift = h * 0.22; // the eye sits a little above the hinge
      const rad = ((parseFloat(css('angle')) || 84) * Math.PI) / 180;
      const hinge = (bottom - r.top) / k;
      return {
        k, bottom, depth, lift, rad, hinge,
        origin: `${((left + right) / 2 - r.left) / k}px ${hinge - lift}px`,
        inset: [top - r.top, r.right - right, left - r.left].map((n) => Math.max(n, 0) / k),
        // Height of screen the page still covers once tipped by `phi`
        cover: (phi) => (lift - ((lift - h * Math.cos(phi)) * depth) / (depth + h * Math.sin(phi))) * k,
      };
    };

    const pose = (g, phi, round, light) => ({
      transform: `perspective(${g.depth}px) translateY(${g.lift}px) rotateX(${phi}rad) translateY(${-g.lift}px)`,
      clipPath: `inset(${g.clip} round ${round}px)`,
      filter: `brightness(${light})`,
    });
    const swing = (g) => [pose(g, 0, 0, 1), pose(g, g.rad, 24, parseFloat(css('shade')) || 0.6)];

    // A flex or grid page shares its height out among its children: for the ride their sizes
    // are held as they are, so a shorter page box changes nothing inside
    const hold = (page, style) => {
      if (style.display.includes('grid')) {
        page.style.gridTemplateRows = style.gridTemplateRows;
        page.style.gridTemplateColumns = style.gridTemplateColumns;
      } else if (style.display.includes('flex')) {
        const column = style.flexDirection.startsWith('column');
        tilt.held = [...page.children].map((el) => {
          const own = getComputedStyle(el);
          const item = { el, flex: el.style.flex, attr: el.hasAttribute('style') };
          el.style.flex = `0 0 ${column ? own.height : own.width}`;
          return item;
        });
      }
    };

    const release = () => {
      tilt.held.forEach(({ el, flex, attr }) => {
        el.style.flex = flex;
        if (!attr && !el.getAttribute('style')) el.removeAttribute('style');
      });
      tilt.held = [];
      Object.assign(tilt.page.style, tilt.cut);
    };

    // With the page untransformed: where it is, where its fixed elements are. Below the hinge
    // the page would swing towards the eye and stretch the scroll area: its box ends at the
    // hinge for the ride (the space it leaves is kept as margin). Checked on the spot: if that
    // moves anything inside, even with the children held, the page is left as it was
    const rig = () => {
      const { page } = tilt;
      letGo(tilt.fixed);
      release();
      const g = measure(page);
      tilt.fixed = fixedInside(page);
      const style = getComputedStyle(page);
      const full = page.offsetHeight;
      let end = full;
      if (g.hinge < full) {
        const edges = style.boxSizing === 'border-box' ? 0 : ['paddingTop', 'paddingBottom', 'borderTopWidth', 'borderBottomWidth'].reduce((sum, side) => sum + parseFloat(style[side]), 0);
        const margin = parseFloat(style.marginBottom) || 0;
        const boxes = (els) => els.map((el) => el.getBoundingClientRect()).map((r) => [r.top, r.left, r.width, r.height]);
        const kids = [...page.children];
        const before = boxes(kids);
        const cut = () => {
          page.style.height = `${Math.max(g.hinge - edges, 0)}px`;
          page.style.overflowY = 'clip';
          page.style.marginBottom = `${margin + full - g.hinge}px`;
          return boxes(kids).some((box, i) => box.some((n, j) => Math.abs(n - before[i][j]) > 0.5));
        };
        let moved = cut();
        if (moved && /flex|grid/.test(style.display)) {
          release();
          hold(page, style);
          moved = cut();
        }
        if (moved) release();
        else end = g.hinge;
      }
      const [top, right, left] = g.inset;
      g.clip = [top, right, Math.max(end - g.hinge, 0), left].map((n) => `${n}px`).join(' ');
      page.style.transformOrigin = g.origin;
      panel.style.setProperty('--kz-trapdoor-fold', `${Math.round(g.cover(g.rad))}px`);
      return g;
    };

    // The image beside the link it belongs to, without leaving the column
    const place = (instant) => {
      const link = links[active];
      if (!link || !figure || !media?.offsetHeight) return;
      const centre = nav.offsetTop + link.offsetTop + link.offsetHeight / 2 - media.offsetTop;
      const room = media.offsetHeight - figure.offsetHeight;
      const y = Math.max(0, Math.min(room, centre - frame.offsetHeight / 2));
      if (instant) figure.classList.add('is-placing');
      figure.style.setProperty('--kz-trapdoor-y', `${Math.round(y)}px`);
      if (instant) {
        void figure.offsetWidth;
        figure.classList.remove('is-placing');
      }
    };

    // Pointing at a link: the image slides next to it and the new picture wipes in from the
    // side it comes from, over the old one; the caption rolls the same way
    const activate = (i, instant = false) => {
      if (i === active || !links[i]) return;
      const down = i > active;
      const was = active;
      active = i;
      links.forEach((link, j) => link.classList.toggle('is-active', j === i));
      place(instant);
      const ms = instant || reduced ? 0 : 1;
      const image = images[i];
      if (image && image !== images[was]) {
        image.classList.add('is-shown');
        image.style.zIndex = String(++layer);
        image.animate([
          { clipPath: down ? 'inset(100% 0% 0% 0%)' : 'inset(0% 0% 100% 0%)', scale: 1.18 },
          { clipPath: 'inset(0% 0% 0% 0%)', scale: 1 },
        ], { duration: 800 * ms, easing: SWING }).finished.then(() => {
          if (images[active] === image) images.forEach((el) => el !== image && el.classList.remove('is-shown'));
        }, () => {});
      }
      const next = captions[i];
      if (next && next !== captions[was]) {
        const from = down ? 110 : -110;
        captions[was]?.animate([{ transform: `translateY(${-from}%)` }], { duration: 600 * ms, easing: RISE, fill: 'forwards' });
        next.animate([{ transform: `translateY(${from}%)` }, { transform: 'translateY(0%)' }], { duration: 600 * ms, easing: RISE, fill: 'forwards' });
      }
    };

    // The opening, as one timeline. Every animation gets an end delay that makes it as long as
    // the longest, so running them all backwards is the exact reverse, even halfway through.
    const build = (mode, g) => {
      const steps = [];
      const add = (el, frames, delay, duration, easing = RISE, extra = {}) => {
        if (el) steps.push([el, frames, { delay, duration, easing, ...extra }]);
      };
      if (mode === 'reduced') {
        add(panel, [{ opacity: 0 }, { opacity: 1 }], 0, 180, 'ease');
      } else {
        const time = (parseFloat(css('duration')) || 1.1) * 1000;
        const ease = css('ease') || 'cubic-bezier(0.76, 0, 0.24, 1)';
        // A row rises as the edge of the page goes past it (flat: once the panel is down)
        let uncover = (i) => 260 + i * 70;
        if (mode === 'tilt') {
          add(tilt.page, swing(g), 0, time, ease);
          const samples = curve(ease);
          const rows = links.map((link) => link.getBoundingClientRect().bottom);
          uncover = (i) => (samples.find(([, p]) => g.bottom - g.cover(g.rad * p) >= rows[i]) || [1])[0] * time;
        } else {
          add(panel, [{ clipPath: 'inset(0% 0% 100% 0%)' }, { clipPath: 'inset(0% 0% 0% 0%)' }], 0, 700, SWING);
        }
        add(stage, [{ scale: 0.96 }, { scale: 1 }], 0, time, ease);
        add(cross, [{ transform: 'translateY(0px) rotate(0deg)' }, { transform: 'translateY(3.25px) rotate(45deg)' }], 200, 600, RISE, { pseudoElement: '::before' });
        add(cross, [{ transform: 'translateY(0px) rotate(0deg)' }, { transform: 'translateY(-3.25px) rotate(-45deg)' }], 200, 600, RISE, { pseudoElement: '::after' });
        let at = 50;
        links.forEach((link, i) => {
          at = Math.max(at + 70, uncover(i) - 160);
          add(link, [{ transform: 'scaleX(0)' }, { transform: 'scaleX(1)' }], at - 60, 900, SWING, { pseudoElement: '::before' });
          add(link.querySelector('.kodza-trapdoor__word'), [{ transform: 'translateY(140%)' }, { transform: 'translateY(0%)' }], at, 950);
          link.querySelectorAll('.kodza-trapdoor__index, .kodza-trapdoor__meta').forEach((small) => {
            add(small, [{ opacity: 0, transform: 'translateY(6px)' }, { opacity: 1, transform: 'translateY(0px)' }], at + 220, 600);
          });
        });
        add(frame, [{ clipPath: 'inset(100% 0% 0% 0%)', scale: 1.08 }, { clipPath: 'inset(0% 0% 0% 0%)', scale: 1 }], at + 60, 900);
        add(caption, [{ opacity: 0 }, { opacity: 1 }], at + 560, 500, 'ease');
        infos.forEach((info, i) => {
          add(info, [{ opacity: 0, transform: 'translateY(10px)' }, { opacity: 1, transform: 'translateY(0px)' }], at + 220 + i * 70, 650);
        });
      }
      const total = Math.max(...steps.map(([, , o]) => o.delay + o.duration));
      return steps.map(([el, frames, o]) => el.animate(frames, { ...o, fill: 'both', endDelay: total - o.delay - o.duration }));
    };

    const play = (forward) => {
      const token = ++run;
      sequence.forEach((animation) => {
        animation.updatePlaybackRate(forward ? 1 : -BACK);
        animation.play();
      });
      Promise.all(sequence.map((animation) => animation.finished)).then(() => {
        if (token !== run) return;
        if (forward) state = 'open';
        else land();
      }, () => {});
    };

    // Down again: the animations, the borrowed styles and the listeners go, the panel goes home
    const land = () => {
      run++;
      sequence.forEach((animation) => animation.cancel());
      panel.getAnimations({ subtree: true }).forEach((animation) => animation.cancel());
      sequence = [];
      session?.abort();
      session = null;
      if (tilt) {
        const { page, origin, background, attr, layer } = tilt;
        letGo(tilt.fixed);
        release();
        Object.assign(page.style, layer);
        page.style.transformOrigin = origin;
        page.style.backgroundColor = background;
        if (!attr && !page.getAttribute('style')) page.removeAttribute('style');
        if (tilted.get(page) === land) tilted.delete(page);
        tilt = null;
      }
      try {
        if (panel.popover && panel.matches(':popover-open')) panel.hidePopover();
      } catch {
        // no popover support: it was a plain fixed layer
      }
      panel.removeAttribute('popover');
      panel.removeAttribute('style');
      panel.hidden = true;
      if (panel.parentNode !== home[0]) home[0].insertBefore(panel, home[1]?.parentNode === home[0] ? home[1] : null);
      images.forEach((image) => {
        image.classList.remove('is-shown');
        image.style.removeProperty('z-index');
        if (!image.getAttribute('style')) image.removeAttribute('style');
      });
      links.forEach((link) => link.classList.remove('is-active'));
      figure?.style.removeProperty('--kz-trapdoor-y');
      if (figure && !figure.getAttribute('style')) figure.removeAttribute('style');
      active = -1;
      state = 'closed';
      const next = then;
      then = null;
      next?.();
    };

    // While open the page stays put: a wheel or a swipe only scrolls what scrolls in the menu
    const scrollsInside = (target, x, y, dy) => {
      for (let el = target; el instanceof Element && panel.contains(el); el = el.parentElement) {
        const box = el.getBoundingClientRect();
        if (x < box.left || x > box.right || y < box.top || y > box.bottom) continue;
        if (!/(auto|scroll)/.test(getComputedStyle(el).overflowY) || el.scrollHeight <= el.clientHeight + 1) continue;
        if (dy > 0 ? el.scrollTop + el.clientHeight < el.scrollHeight - 1 : el.scrollTop > 0) return true;
      }
      return false;
    };

    const keydown = (event) => {
      if (state === 'closing' || event.defaultPrevented) return;
      if (event.key === 'Escape') {
        event.preventDefault();
        shut();
        return;
      }
      const current = document.activeElement;
      if (event.key === 'Tab') {
        const stops = all(FOCUSABLE).filter((el) => el.getClientRects().length);
        const first = stops[0];
        const last = stops[stops.length - 1];
        const outside = !panel.contains(current) || current === panel;
        if (outside || (event.shiftKey && current === first) || (!event.shiftKey && current === last)) {
          event.preventDefault();
          (event.shiftKey ? last : first)?.focus();
        }
        return;
      }
      const i = links.indexOf(current);
      if (event.key === 'ArrowDown' || event.key === 'ArrowUp') {
        event.preventDefault();
        const step = event.key === 'ArrowDown' ? 1 : -1;
        links[i < 0 ? (step > 0 ? 0 : links.length - 1) : (i + step + links.length) % links.length]?.focus();
      } else if (event.key === 'Home' || event.key === 'End') {
        event.preventDefault();
        links[event.key === 'Home' ? 0 : links.length - 1]?.focus();
      } else if ([' ', 'PageUp', 'PageDown'].includes(event.key) && !current?.closest?.('button, input, select, textarea')) {
        event.preventDefault();
      }
    };

    const listen = (s) => {
      let last = 0;
      const at = [scrollX, scrollY];
      document.addEventListener('wheel', (event) => {
        if (!scrollsInside(event.target, event.clientX, event.clientY, event.deltaY)) event.preventDefault();
      }, { passive: false, signal: s });
      document.addEventListener('touchstart', (event) => (last = event.touches[0].clientY), { passive: true, signal: s });
      document.addEventListener('touchmove', (event) => {
        const touch = event.touches[0];
        const dy = last - touch.clientY;
        last = touch.clientY;
        if (!scrollsInside(event.target, touch.clientX, touch.clientY, dy)) event.preventDefault();
      }, { passive: false, signal: s });
      document.addEventListener('keydown', keydown, { signal: s });
      // A scrollbar dragged anyway: the page goes back to where it tipped from
      window.addEventListener('scroll', () => {
        if (scrollX !== at[0] || scrollY !== at[1]) window.scrollTo({ left: at[0], top: at[1], behavior: 'instant' });
      }, { signal: s });
      let queued = 0;
      window.addEventListener('resize', () => {
        if (queued) return;
        queued = requestAnimationFrame(() => {
          queued = 0;
          if (s.aborted) return;
          if (tilt) {
            const effect = sequence[0].effect;
            effect.setKeyframes([]);
            const g = rig();
            effect.setKeyframes(swing(g));
            rideAlong(tilt.fixed, g.k);
          }
          place(true);
        });
      }, { signal: s });
      s.addEventListener('abort', () => cancelAnimationFrame(queued));
      // A click on the page lying at the bottom brings it back
      tilt?.page.addEventListener('click', (event) => {
        if (state === 'closing') return;
        event.preventDefault();
        event.stopPropagation();
        shut();
      }, { capture: true, signal: s });
    };

    const enter = (keyboard) => {
      (keyboard ? links[active] || closer : panel)?.focus({ preventScroll: true });
    };

    const open = (keyboard) => {
      if (state === 'opening' || state === 'open') return;
      toggle.setAttribute('aria-expanded', 'true');
      if (state === 'closing') {
        state = 'opening';
        then = null;
        play(true);
        enter(keyboard);
        return;
      }
      reduced = motion.matches;
      const page = reduced ? null : findPage();
      let g = null;
      if (page) {
        tilted.get(page)?.();
        const { transformOrigin, backgroundColor, height, overflowY, marginBottom, gridTemplateRows, gridTemplateColumns } = page.style;
        tilt = { page, origin: transformOrigin, background: backgroundColor, attr: page.hasAttribute('style'), cut: { height, overflowY, marginBottom, gridTemplateRows, gridTemplateColumns }, fixed: [], held: [], layer: {} };
        tilted.set(page, land);
        g = rig();
        const shown = getComputedStyle(page);
        if (transparent(shown.backgroundColor)) page.style.backgroundColor = ground(page);
        // Page over panel over the rest of the theme (a header, a sticky bar), under the admin bar
        const { position, zIndex } = page.style;
        tilt.layer = { position, zIndex };
        const still = shown.position === 'static';
        if (!still || ['top', 'right', 'bottom', 'left'].every((side) => shown[side] === 'auto')) {
          if (still) page.style.position = 'relative';
          page.style.zIndex = '99991';
          panel.style.zIndex = '99990';
        }
      }
      // The panel leaves the menu while open, so the styles of a theme's content (links,
      // paragraphs) never reach it: right under the page, or at the end of the document
      VARS.forEach((name) => panel.style.setProperty(`--kz-trapdoor-${name}`, css(name)));
      panel.style.fontFamily = getComputedStyle(root).fontFamily;
      if (page) page.before(panel);
      else document.body.append(panel);
      panel.hidden = false;
      if (!page) {
        try {
          panel.popover = 'manual';
          panel.showPopover();
        } catch {
          // no popover support: a fixed layer over the page
        }
      }
      const current = links.findIndex((link) => link.getAttribute('aria-current'));
      activate(Math.max(current, 0), true);
      sequence = build(page ? 'tilt' : reduced ? 'reduced' : 'flat', g);
      if (tilt) rideAlong(tilt.fixed, g.k);
      session = new AbortController();
      listen(session.signal);
      state = 'opening';
      play(true);
      enter(keyboard);
    };

    const shut = (after) => {
      if (state === 'closed' || state === 'closing') return;
      then = after || null;
      state = 'closing';
      toggle.setAttribute('aria-expanded', 'false');
      toggle.focus({ preventScroll: true });
      play(false);
    };

    // Keyboard (Enter, Space) clicks have no detail: the focus then goes to the first link
    toggle.addEventListener('click', (event) => open(event.detail === 0), { signal });
    closer?.addEventListener('click', () => shut(), { signal });
    links.forEach((link, i) => {
      link.addEventListener('pointerenter', (event) => event.pointerType !== 'touch' && activate(i), { signal });
      link.addEventListener('focus', () => activate(i), { signal });
      // A link to this very page (#section, or just #) closes the menu first, then goes there
      link.addEventListener('click', (event) => {
        const here = link.origin === location.origin && link.pathname === location.pathname && link.search === location.search;
        if (!here || event.defaultPrevented || event.metaKey || event.ctrlKey || event.shiftKey || event.altKey) return;
        event.preventDefault();
        const hash = link.hash;
        shut(hash ? () => (location.hash = hash) : null);
      }, { signal });
    });
    // Back from another page (bfcache): the menu is closed, the page flat
    window.addEventListener('pageshow', (event) => event.persisted && state !== 'closed' && land(), { signal });

    // Stopped while open: the page is put down at once and the panel goes back in place
    signal.addEventListener('abort', () => {
      then = null;
      if (state !== 'closed') land();
    });
  }

  // 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).