# Media Expand

> An image or a video in a rounded frame, set in from the edges, takes the full width as the scroll brings it to the middle of the screen. The corners square off, the caption rises, and it all reverses on the way back up.

Scroll · scroll, image, video, clip-path, expand, full width, showreel, landing · HTML, CSS, vanilla JS · no dependencies · updated 2026-11-06
Demo: https://kodza.dev/components/media-expand/
Source on GitHub: https://github.com/kodza-dev/kodza/tree/main/components/media-expand

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-media-expand.css`](https://kodza.dev/registry/media-expand/kodza-media-expand.css) · 10.3 KB
- [`kodza-media-expand.js`](https://kodza.dev/registry/media-expand/kodza-media-expand.js) · 8.6 KB
- [`kodza-media-expand.html`](https://kodza.dev/registry/media-expand/kodza-media-expand.html) · 0.7 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-media-expand.css https://kodza.dev/registry/media-expand/kodza-media-expand.css
curl -fsSL --create-dirs -o kodza/kodza-media-expand.js https://kodza.dev/registry/media-expand/kodza-media-expand.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`.)

**Its images are free to use in what you ship** (Kodza house images, Kodza License). The HTML loads them from kodza.dev, whose addresses can change: copy them into the project and point each `src` to the copy (a Claude artifact embeds them instead, as Use it says).

```bash
curl -fsSL --create-dirs -o kodza/media/kz-gap-1400.webp https://kodza.dev/media/kz-gap-1400.webp
curl -fsSL --create-dirs -o kodza/media/kz-gap-2400.webp https://kodza.dev/media/kz-gap-2400.webp
```

## API

- Root: `[data-kodza-media-expand]`
- Variables (set them on the root element itself: it declares its own defaults):
  - `--kz-media-expand-ratio: 16 / 9`
  - `--kz-media-expand-ratio-medium: 4 / 3`
  - `--kz-media-expand-ratio-narrow: 4 / 5`
  - `--kz-media-expand-max-height: 100svh`
  - `--kz-media-expand-inset: 8%`
  - `--kz-media-expand-radius: calc(24px * var(--kz-radius-scale, 1))`
  - `--kz-media-expand-radius-end: 0px`
  - `--kz-media-expand-zoom: 1.12`
  - `--kz-media-expand-caption-ink: #fff`
  - `--kz-media-expand-caption-pad: clamp(20px, 4.5cqi, 56px)`
  - `--kz-media-expand-veil: rgba(10, 10, 10, 0.6)`
  - `--kz-media-expand-mono: var(--kz-font-mono, "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace)`
  - `--kz-media-expand-duration: 0.7s`
  - `--kz-media-expand-ease: cubic-bezier(0.22, 1, 0.36, 1)`
- Attributes:
  - `data-kodza-media-expand`
- Lifecycle: `kodza:init` / `kodza:destroy` on `document`, with `{ detail: { root } }` to target a container.

## Images

The shape of each image slot, measured in the demo at 1440 × 900 (desktop) and 390 × 844 (mobile). Where the shape is fixed, the frame crops the image to it: export in that shape, keep the subject near the centre, at twice the widest size shown (sharp on retina screens).

| Slot | Desktop | Mobile | Widest shown |
| --- | --- | --- | --- |
| `.kodza-media-expand__frame img` | 16:9 | 4:5 | 1440 px |

## Dark mode

Nothing to set: it takes its colours from the text around it, or looks the same on a light and a dark page.

Its images have dark versions next to them (`kz-gap-1400.webp` → `kz-gap-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-media-expand.css` next to the page (the Files commands as they are), linked in `<head>`: `<link rel="stylesheet" href="kodza/kodza-media-expand.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-media-expand.js`, loaded with `<script src="kodza/kodza-media-expand.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); `--kz-font-mono`, the monospace face (code, labels, counters). 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).
- 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$/{r kodza/kodza-media-expand.css' -e 'd' -e '}' -e '/^KODZA-JS$/{r kodza/kodza-media-expand.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); `--kz-font-mono`, the monospace face (code, labels, counters).
- 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).
- 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.
- 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 spans the page: a block theme keeps a Custom HTML block to the width of the text column, so put it inside a **Group** block set to **Full width**, with **Inner blocks use content width** turned off.
- 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-media-expand', $uri . 'kodza-media-expand.css', [], filemtime($dir . 'kodza-media-expand.css'));
    wp_enqueue_script('kodza-media-expand', $uri . 'kodza-media-expand.js', [], filemtime($dir . 'kodza-media-expand.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: it takes the colour of the text around it (or keeps its own monochrome): nothing to point at the theme.
- 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.
- This one spans the page: give the widget its own container, **Content Width: Full Width**, padding 0.
- 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-media-expand.css` and `assets/kodza-media-expand.js` (the Files commands with `-o assets/…`).
- In the section: `{{ 'kodza-media-expand.css' | asset_url | stylesheet_tag }}` and `<script src="{{ 'kodza-media-expand.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/`): `MediaExpand.tsx` (below), the CSS block under Code saved as `media-expand.css` and the JS block as `media-expand.js`, both as they are. The HTML block is already inside the component: skip it.
- Use it: `import { MediaExpand } from '@/components/kodza/MediaExpand';` then `<MediaExpand />`. Props: `vars` (the `--kz-…` variables listed under API, e.g. `vars={{ '--kz-media-expand-ratio': … }}`), `className`, `style` and the other props of its `<figure>` (`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 './media-expand.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 — Media Expand, for React. From https://kodza.dev/components/media-expand/
// 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: media-expand.css and media-expand.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 './media-expand.css';

export type MediaExpandProps = Omit<ComponentPropsWithoutRef<'figure'>, "children" | "vars"> & {
  /** Settings, as CSS variables on the root */
  vars?: {
    /** default: 16 / 9 */
    "--kz-media-expand-ratio"?: string | number;
    /** default: 4 / 3 */
    "--kz-media-expand-ratio-medium"?: string | number;
    /** default: 4 / 5 */
    "--kz-media-expand-ratio-narrow"?: string | number;
    /** default: 100svh */
    "--kz-media-expand-max-height"?: string | number;
    /** default: 8% */
    "--kz-media-expand-inset"?: string | number;
    /** default: calc(24px * var(--kz-radius-scale, 1)) */
    "--kz-media-expand-radius"?: string | number;
    /** default: 0px */
    "--kz-media-expand-radius-end"?: string | number;
    /** default: 1.12 */
    "--kz-media-expand-zoom"?: string | number;
    /** default: #fff */
    "--kz-media-expand-caption-ink"?: string | number;
    /** default: clamp(20px, 4.5cqi, 56px) */
    "--kz-media-expand-caption-pad"?: string | number;
    /** default: rgba(10, 10, 10, 0.6) */
    "--kz-media-expand-veil"?: string | number;
    /** default: var(--kz-font-mono, "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace) */
    "--kz-media-expand-mono"?: string | number;
    /** default: 0.7s */
    "--kz-media-expand-duration"?: string | number;
    /** default: cubic-bezier(0.22, 1, 0.36, 1) */
    "--kz-media-expand-ease"?: string | number;
  };
  className?: string;
};

export function MediaExpand({ vars, className, style, ...rest }: MediaExpandProps) {
  const ref = useRef<ComponentRef<'figure'>>(null);
  const classes = ["kodza-media-expand", 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('./media-expand.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 (
    <figure data-kodza-media-expand="" key={key} {...rest} className={classes} data-kodza-manual style={{ ...vars, ...style } as CSSProperties} ref={ref}>
      <div className="kodza-media-expand__frame">
        <img src="https://kodza.dev/media/kz-gap-1400.webp" srcSet="https://kodza.dev/media/kz-gap-1400.webp 1400w, https://kodza.dev/media/kz-gap-2400.webp 2400w" sizes="(max-width: 559px) 300vw, 150vw" alt="A long concrete wall split down the middle, a low sun pouring a band of light through the slit" width="1400" height="583" loading="lazy" />
      </div>
      <figcaption className="kodza-media-expand__caption">
        <span className="kodza-media-expand__label">Case 07 — Étretat, 2026</span>
        {' '}
        <span className="kodza-media-expand__title">Less deck. More building.</span>
      </figcaption>
    </figure>
  );
}
```

## Code

```html
<figure class="kodza-media-expand" data-kodza-media-expand>
  <div class="kodza-media-expand__frame">
    <img src="https://kodza.dev/media/kz-gap-1400.webp" srcset="https://kodza.dev/media/kz-gap-1400.webp 1400w, https://kodza.dev/media/kz-gap-2400.webp 2400w" sizes="(max-width: 559px) 300vw, 150vw" alt="A long concrete wall split down the middle, a low sun pouring a band of light through the slit" width="1400" height="583" loading="lazy">
  </div>
  <figcaption class="kodza-media-expand__caption">
    <span class="kodza-media-expand__label">Case 07 — Étretat, 2026</span>
    <span class="kodza-media-expand__title">Less deck. More building.</span>
  </figcaption>
</figure>
```

```css
/* Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license */
/* Kodza — Media Expand
   An image (or a muted video) waits in a rounded frame, set in from the edges. Scrolled to the
   middle of the screen, it takes the whole width: the corners go square as they reach the edges,
   the picture settles from a slight zoom, and once it is full the caption rises from its mask.
   Scroll back up and it all plays in reverse. The width follows the scroll itself; only the
   caption plays on its own.
   Tuned with the --kz-media-expand-* variables; the smoothing and the caption's thresholds are
   constants at the top of component.js. */
.kodza-media-expand {
  /* The frame's shape: the picture is cropped to it, never stretched */
  --kz-media-expand-ratio: 16 / 9;
  /* The same frame on a medium width (560 to 900px), then on a narrow one (under 560px), where a
     wide one would be a strip */
  --kz-media-expand-ratio-medium: 4 / 3;
  --kz-media-expand-ratio-narrow: 4 / 5;
  /* Never taller than the screen: past it, the picture is cropped instead */
  --kz-media-expand-max-height: 100svh;
  /* How far the frame is set in at rest, on each side (a share of its width and height) */
  --kz-media-expand-inset: 8%;
  /* Corners at rest, and once full (0: square, flush with the edges) */
  --kz-media-expand-radius: calc(24px * var(--kz-radius-scale, 1));
  --kz-media-expand-radius-end: 0px;
  /* The picture's zoom at rest; it settles to 1 as the frame opens */
  --kz-media-expand-zoom: 1.12;
  /* The caption over the picture, and the veil that keeps it readable */
  --kz-media-expand-caption-ink: #fff;
  --kz-media-expand-caption-pad: clamp(20px, 4.5cqi, 56px);
  --kz-media-expand-veil: rgba(10, 10, 10, 0.6);
  --kz-media-expand-mono: var(--kz-font-mono, "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace);
  --kz-media-expand-duration: 0.7s;
  --kz-media-expand-ease: cubic-bezier(0.22, 1, 0.36, 1);

  position: relative;
  container-type: inline-size;
  margin: 0;
}

/* The frame: clipped from the inset to the full box as the script writes the progress (0 at
   rest, 1 full). Without the script, it is simply full */
.kodza-media-expand__frame {
  --kz-media-expand-rest: calc(1 - var(--kz-media-expand-progress, 1));
  position: relative;
  width: 100%;
  aspect-ratio: var(--kz-media-expand-ratio);
  max-height: var(--kz-media-expand-max-height);
  overflow: hidden;
  clip-path: inset(
    calc(var(--kz-media-expand-inset) * var(--kz-media-expand-rest))
    round calc(var(--kz-media-expand-radius-end) + (var(--kz-media-expand-radius) - var(--kz-media-expand-radius-end)) * var(--kz-media-expand-rest))
  );
}

.kodza-media-expand__frame > img,
.kodza-media-expand__frame > video,
.kodza-media-expand__frame > picture,
.kodza-media-expand__frame > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
}

.kodza-media-expand__frame > img,
.kodza-media-expand__frame > video,
.kodza-media-expand__frame > picture {
  transform: scale(calc(1 + (var(--kz-media-expand-zoom) - 1) * var(--kz-media-expand-rest)));
}

/* The veil under the caption: a dark falloff from the bottom edge, shown with it */
.kodza-media-expand__frame::after {
  content: "";
  position: absolute;
  inset: 45% 0 0;
  background: linear-gradient(to top, var(--kz-media-expand-veil), var(--kz-media-expand-veil) 40%, transparent);
  pointer-events: none;
}

.kodza-media-expand__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: grid;
  gap: 10px;
  justify-items: start;
  padding: var(--kz-media-expand-caption-pad);
  color: var(--kz-media-expand-caption-ink);
  pointer-events: none;
}

/* Each line rides up from behind its own mask (the script wraps its text in __rise) */
.kodza-media-expand__label,
.kodza-media-expand__title {
  display: block;
  max-width: 100%;
  overflow: hidden;
}

.kodza-media-expand__label {
  font-family: var(--kz-font-label, var(--kz-media-expand-mono));
  font-size: var(--kz-font-label-size, 12.5px);
  font-weight: var(--kz-font-label-weight, 500);
  line-height: var(--kz-font-label-leading, 1.4);
  letter-spacing: var(--kz-font-label-tracking, 0.02em);
  text-transform: var(--kz-font-label-case, inherit);
  opacity: 0.88;
}

.kodza-media-expand__title {
  /* Room for the descenders inside the mask */
  padding-bottom: 0.08em;
  margin-bottom: -0.08em;
  font-family: var(--kz-font-display, inherit);
  font-size: calc(clamp(26px, 5.2cqi, 64px) * var(--kz-font-display-scale, 1));
  font-weight: var(--kz-font-display-weight, 600);
  line-height: 1.02;
  letter-spacing: var(--kz-font-display-tracking, -0.045em);
  text-transform: var(--kz-font-display-case, inherit);
  text-wrap: balance;
}

.kodza-media-expand__rise {
  display: block;
}

/* Moving (the script runs and motion is allowed): the caption and its veil wait below until the
   frame is full, then rise; they drop back, quicker, as soon as it starts closing */
.kodza-media-expand.is-moving .kodza-media-expand__rise {
  transform: translate3d(0, 110%, 0);
  transition: transform calc(0.4s * var(--kz-motion-scale, 1)) cubic-bezier(0.65, 0, 0.35, 1);
}

.kodza-media-expand.is-moving .kodza-media-expand__frame::after {
  opacity: 0;
  transition: opacity calc(0.4s * var(--kz-motion-scale, 1)) cubic-bezier(0.65, 0, 0.35, 1);
}

.kodza-media-expand.is-moving.is-full .kodza-media-expand__rise {
  transform: none;
  transition: transform calc(var(--kz-media-expand-duration) * var(--kz-motion-scale, 1)) var(--kz-media-expand-ease);
}

.kodza-media-expand.is-moving.is-full .kodza-media-expand__title .kodza-media-expand__rise {
  transition-delay: calc(0.08s * var(--kz-motion-scale, 1));
}

.kodza-media-expand.is-moving.is-full .kodza-media-expand__frame::after {
  opacity: 1;
  transition: opacity calc(var(--kz-media-expand-duration) * var(--kz-motion-scale, 1)) var(--kz-media-expand-ease);
}

@container (max-width: 899.98px) {
  .kodza-media-expand__frame {
    aspect-ratio: var(--kz-media-expand-ratio-medium);
  }
}

@container (max-width: 559.98px) {
  .kodza-media-expand__frame {
    aspect-ratio: var(--kz-media-expand-ratio-narrow);
  }
}

@media (prefers-reduced-motion: reduce) {
  .kodza-media-expand *,
  .kodza-media-expand *::before,
  .kodza-media-expand *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* kodza-guard f9813a3bac93 — 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-media-expand__caption):not(#_),
:where(.kodza-media-expand__frame img:where(:not([class*="kodza-"]))):not(#_) {
  transition-duration: revert;
}

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

.kodza-media-expand:not(#_) {
  border: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: 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-media-expand__frame:not(#_),
.kodza-media-expand__label:not(#_),
.kodza-media-expand__rise:not(#_),
.kodza-media-expand__title:not(#_) {
  box-sizing: revert;
}

.kodza-media-expand__caption:not(#_) {
  border: revert;
  margin: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: 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;
  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-media-expand__frame img:where(:not([class*="kodza-"])):not(#_) {
  border: revert;
  margin: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: 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-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;
  transition-property: revert;
  transition-timing-function: revert;
  transition-delay: revert;
}

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

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

.kodza-media-expand__frame:not(#_)::after {
  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-media-expand:not(#_) {
  position: relative;
}

.kodza-media-expand__frame > img:not(#_) {
  display: block;
  max-width: none;
}

.kodza-media-expand__caption:not(#_) {
  position: absolute;
  display: grid;
  padding: var(--kz-media-expand-caption-pad);
  color: var(--kz-media-expand-caption-ink);
}

@media (prefers-reduced-motion: reduce) {
  .kodza-media-expand *:where(img, figcaption):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 — Media Expand
// Writes the frame's progress (0 at rest, 1 full) as the scroll carries it from the bottom of the
// screen to the middle, with a soft follow; the CSS turns it into the inset, the corners and the
// zoom. Once full, the caption rises (is-full), and drops back as soon as the frame closes.
// Reduced motion, or a site pace of 0: the frame is full and the caption shown, nothing moves.
(() => {
  const SELECTOR = '[data-kodza-media-expand]';
  // How long the frame takes to catch up with the scroll, in ms (times the site's pace): a soft
  // follow instead of a frame glued to the wheel. 0 glues it
  const SMOOTHING = 120;
  // The caption rises once the frame is this full, and drops back below the second: the gap keeps
  // it from flickering when the scroll stops right on the edge
  const CAPTION_IN = 0.97;
  const CAPTION_OUT = 0.9;
  // The progress left to travel below this ends the loop
  const SETTLE = 0.0005;

  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 clamp = (value, min, max) => Math.min(max, Math.max(min, value));
  // Slow out of the rest, slow into the full width: the corners square off gently at the edges
  const ease = (t) => (t < 0.5 ? 4 * t * t * t : 1 - (-2 * t + 2) ** 3 / 2);

  // One instance, with its own state: two copies on a page never interfere. Everything it
  // starts is tied to `signal` (listeners get { signal }, observers and timers stop on its
  // 'abort' event), so kodza:destroy stops it all.
  function mount(root, signal) {
    const frame = root.querySelector('.kodza-media-expand__frame');
    if (!frame) return;
    // Each caption line gets an inner span, the part that rides up from behind the line's mask
    root.querySelectorAll('.kodza-media-expand__label, .kodza-media-expand__title').forEach((line) => {
      const rise = document.createElement('span');
      rise.className = 'kodza-media-expand__rise';
      rise.append(...line.childNodes);
      line.append(rise);
    });

    const pace = paceOf(root);
    const still = reduceMotion || !pace; // the still path: no motion asked, by the visitor or the site
    if (still) return;
    const smoothing = SMOOTHING * pace;

    let current = null; // the progress written now
    let raf = 0;
    let last = 0;
    let shown = false;

    // 0 while the frame's middle is at the bottom of the screen, 1 once it reaches the middle of
    // the screen. Read on the figure, whose box the clip never changes
    const goal = () => {
      const rect = root.getBoundingClientRect();
      return ease(clamp((innerHeight - rect.top - rect.height / 2) / (innerHeight / 2), 0, 1));
    };
    const write = () => {
      root.style.setProperty('--kz-media-expand-progress', current.toFixed(4));
      if (current >= CAPTION_IN) root.classList.add('is-full');
      else if (current < CAPTION_OUT) root.classList.remove('is-full');
    };
    const tick = (now) => {
      raf = 0;
      const to = goal();
      const step = last ? Math.min(now - last, 64) : 16.7;
      last = now;
      if (current === null || !smoothing) current = to;
      else current += (to - current) * (1 - Math.exp(-step / smoothing));
      if (Math.abs(to - current) < SETTLE) current = to;
      write();
      if (current !== to) raf = requestAnimationFrame(tick);
      else last = 0;
    };
    const queue = () => {
      if (!shown || raf) return;
      raf = requestAnimationFrame(tick);
    };

    // Placed before it first shows, so it never opens in front of you on load
    current = goal();
    write();
    root.classList.add('is-moving');

    const io = new IntersectionObserver(([entry]) => {
      shown = entry.isIntersecting;
      if (shown) {
        current = goal(); // back on screen after a jump (an anchor, Home): placed, not chased
        write();
        queue();
      }
    });
    io.observe(root);
    const resize = new ResizeObserver(queue);
    resize.observe(root);
    window.addEventListener('scroll', queue, { passive: true, signal });
    window.addEventListener('resize', queue, { signal });
    signal.addEventListener('abort', () => {
      io.disconnect();
      resize.disconnect();
      cancelAnimationFrame(raf);
    });
  }

  // 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).