Pixijs Accessibility

Enable screen reader and keyboard navigation via PixiJS's AccessibilitySystem. The system creates an invisible shadow DOM overlay positioned over accessible containers so assistive technology can discover and activate them.

## Quick Start

```ts
const button = new Sprite(await Assets.load("button.png"));
button.accessible = true;
button.accessibleTitle = "Play game";
button.accessibleHint = "Starts a new game session";
button.eventMode = "static";
button.tabIndex = 0;
app.stage.addChild(button);

app.renderer.accessibility.setAccessibilityEnabled(true);

button.on("pointertap", () => startGame());
```

**Related skills:** `pixijs-events` (pointer/tap handlers), `pixijs-scene-dom-container` (HTML elements on canvas), `pixijs-application` (init options).

**Key points:**

- By default the system activates only after the user presses Tab. Set `enabledByDefault: true` in Application init for immediate activation.
- On mobile, the system creates a hidden touch hook; screen-reader focus activates accessibility for the whole session.
- The AccessibilitySystem requires the main thread; it is not available in a Web Worker.

## Core Patterns

### Container accessible properties

```ts
import { Container, Sprite } from "pixi.js";

const container = new Container();
container.accessible = true;
container.accessibleTitle = "Navigation menu";
container.accessibleHint = "Contains links to other pages";
container.eventMode = "static"; // required for custom tabIndex to apply
container.tabIndex = 0;
container.accessibleType = "div"; // defaults to 'button'

const sprite = new Sprite();
sprite.accessible = true;
sprite.accessibleTitle = "Close dialog";
sprite.accessibleText = "X"; // text content of the shadow div
sprite.eventMode = "static";
sprite.tabIndex = 1;
```

Available properties on any Container:

- `accessible` (boolean) - enables the accessible overlay div
- `accessibleTitle` (string) - sets the `title` attribute on the shadow div
- `accessibleHint` (string) - sets the `aria-label` attribute
- `accessibleText` (string) - sets inner text content of the shadow div
- `accessibleType` (string) - HTML tag for the shadow element, defaults to `'button'`
- `tabIndex` (number) - tab order for keyboard navigation (only applied when `interactive` is true / `eventMode` is `'static'` or `'dynamic'`)
- `accessibleChildren` (boolean, default `true`) - when `false`, prevents child containers from being accessible
- `accessiblePointerEvents` (string) - CSS `pointer-events` value on the shadow div

### Custom tab order

Give each accessible container a `tabIndex` to control the order assistive tech walks through them. Higher numbers come later; equal numbers fall back to scene-graph order.

```ts
menuButton.accessible = true;
menuButton.eventMode = "static";
menuButton.tabIndex = 1;

playButton.accessible = true;
playButton.eventMode = "static";
playButton.tabIndex = 2;

settingsButton.accessible = true;
settingsButton.eventMode = "static";
settingsButton.tabIndex = 3;
```

`tabIndex` is only forwarded to the shadow div when the container is `interactive` (`eventMode` is `'static'` or `'dynamic'`). Without that, the system clamps the div's tabIndex back to `0`, and the order you set is ignored.

### Programmatic control

```ts
import { Application } from "pixi.js";

const app = new Application();
await app.init({ width: 800, height: 600 });

// Enable accessibility at runtime
app.renderer.accessibility.setAccessibilityEnabled(true);

// Check current