pixijs-scene-dom-container
この Skill は、PixiJS v8 キャンバス上に HTML 要素をシームレスにオーバーレイし、その CSS トランスフォームを PixiJS シーングラフと同期させます。入力フィールド、iframe、ビデオなどのネイティブ DOM 要素をインタラクティブな PixiJS アプリケーションに統合する際に不可欠であり、ゲームオブジェクトの位置と変換に正確に追従させることができます。この Skill は、PixiJS のレンダリング能力と標準 HTML の柔軟性を組み合わせたリッチなハイブリッド体験の開発を大幅に簡素化します。
npx skills add https://github.com/pixijs/pixijs-skills --skill pixijs-scene-dom-containerBefore / After 効果比較
1 组この Skill がない場合、開発者は PixiJS シーン内のオブジェクトの位置、回転、スケールに合わせて HTML 要素の CSS トランスフォームプロパティを手動で計算し、更新する必要がありました。このプロセスは複雑でエラーが発生しやすく、特にシーンが動的に変化する場合、ユーザーは同期ロジックの記述と保守に多大な時間を費やしていました。
この Skill は、HTML 要素の CSS トランスフォームを PixiJS シーングラフと自動的に同期させることで、開発プロセスを大幅に簡素化します。開発者は HTML 要素を `DOMContainer` にラップするだけで、他の PixiJS オブジェクトと同様に管理でき、手動同期の労力とエラー率を大幅に削減します。
DOMContainer positions an HTML element over the PixiJS canvas and drives its CSS transform from the scene graph. Use it for native inputs, iframes, videos, or rich HTML that needs to follow a display object's position. The default pixi.js browser bundle registers the DOMPipe automatically; custom builds add a side-effect import 'pixi.js/dom'.
DOMContaineris marked EXPERIMENTAL in PixiJS v8. The API may change between minor releases.
Assumes familiarity with pixijs-scene-core-concepts. DOMContainer extends ViewContainer, so it's a leaf: do not nest PixiJS children inside it. Nest DOM content inside the HTML element itself, or wrap multiple DOMContainer instances in a Container. Not available in Web Workers; a worker has no DOM to overlay.
Quick Start
import "pixi.js/dom";
const input = document.createElement("input");
input.type = "text";
input.placeholder = "Enter name...";
const dom = new DOMContainer({
element: input,
anchor: 0.5,
});
dom.position.set(app.screen.width / 2, app.screen.height / 2);
app.stage.addChild(dom);
Related skills: pixijs-scene-core-concepts (scene graph basics), pixijs-scene-container (wrap multiple DOM overlays), pixijs-events (pointer handling on canvas vs DOM), pixijs-accessibility (screen-reader overlays).
Constructor options
All Container options (position, scale, tint, label, filters, zIndex, etc.) are also valid here — see skills/pixijs-scene-core-concepts/references/constructor-options.md.
Leaf-specific options added by DOMContainerOptions:
| Option | Type | Default | Description |
|---|---|---|---|
element | HTMLElement | document.createElement('div') | The HTML element the container drives. Any element is valid: input, textarea, iframe, video, div, etc. If omitted, a bare <div> is created. |
anchor | PointData | number | 0 | Origin of the element relative to its own dimensions. 0 is top-left, 0.5 centers, 1 is bottom-right. A single number sets both axes; { x, y } sets each independently. |
tint, filters, mask, and blendMode are accepted (inherited from Container) but have no visual effect — DOM elements live outside the WebGL/WebGPU pipeline. Style the element via CSS for those effects.
Core Patterns
Setup and the side-effect import
import "pixi.js/dom";
import { DOMContainer } from "pixi.js";
Or use the combined import that registers the pipe and re-exports the class:
import { DOMContainer } from "pixi.js/dom";
The default pixi.js browser bundle already imports pixi.js/dom for you via browserAll.ts, so DOMContainer works out of the box in a typical browser app. You only need the explicit import 'pixi.js/dom' line when you set skipExtensionImports: true (custom builds) or when running under a non-browser bundle.
Transforms, anchor, and alpha
const dom = new DOMContainer({
element: document.createElement("div"),
anchor: 0.5,
});
dom.position.set(400, 300);
dom.scale.set(1.5);
dom.rotation = Math.PI / 8;
dom.alpha = 0.5;
Transforms on the DOMContainer propagate to the element as CSS transform. anchor shifts the element's origin relative to its own dimensions: 0 is top-left, 0.5 centers, 1 is bottom-right. A single number sets both axes; an object { x, y } sets each independently. alpha (including inherited parent alpha) is written to the element's style.opacity every frame.
If no element is provided, a <div> is created by default.
Styling the element directly
const panel = document.createElement("div");
panel.innerHTML = "<h2>Score</h2><p>1500</p>";
panel.style.color = "white";
panel.style.fontFamily = "Arial";
panel.style.pointerEvents = "none";
const dom = new DOMContainer({ element: panel });
dom.position.set(50, 50);
app.stage.addChild(dom);
PixiJS does not interfere with CSS styling on the element. The shared root <div> is set to pointer-events: none, and each attached element defaults to pointer-events: auto. Override to none on purely decorative overlays so the canvas still receives clicks underneath them.
Visibility and cleanup
dom.visible = false;
dom.visible = true;
dom.destroy();
Setting visible = false or removing the DOMContainer from the scene graph detaches the element from the DOM. Restoring visibility re-attaches it. destroy() removes the element from its parent node and nulls internal references; the HTML element itself is preserved, so you can re-attach it elsewhere:
const element = dom.element;
dom.destroy();
document.body.appendChild(element);
The DOM container root
The DOMPipe uses a shared root <div> with z-index: 1000 that hosts every attached element. It's exposed as app.domContainerRoot (an HTMLDivElement). All DOMContainer elements render above canvas content; you can't interleave DOM elements between PixiJS draw calls.
On the first render that has an attached DOMContainer, the pipe automatically appends the root to the canvas's parent node. Append it yourself next to app.canvas if you need explicit, stable placement in the DOM tree (for example, when the canvas shares a wrapper with other layered content):
document.body.appendChild(app.canvas);
document.body.appendChild(app.domContainerRoot);
The root uses absolute positioning and its transform is recomputed from the canvas getBoundingClientRect() via a ResizeObserver, so CSS-scaled canvases stay aligned without extra work.
Common Mistakes
[MEDIUM] Missing the pixi.js/dom import in custom builds
The default browser bundle auto-registers DOMPipe, so most apps do not need an explicit import. It is only required when you opt out of auto-imports:
await app.init({ skipExtensionImports: true });
// Now you must add this yourself:
import "pixi.js/dom";
Without registration under a custom build, DOMContainer is still importable but the renderer has no pipe to process it; elements never synchronize with the scene graph and never appear.
[MEDIUM] Expecting filters, masks, or blend modes to affect DOM elements
Wrong:
const dom = new DOMContainer();
dom.filters = [new BlurFilter()];
Correct:
dom.element.style.filter = "blur(4px)";
DOM elements are HTML overlays positioned via CSS transforms; they exist outside the WebGL/WebGPU pipeline. PixiJS filters, masks, and blend modes have no effect on them. Use CSS filters and CSS mix-blend-mode on the element directly.
[MEDIUM] Do not nest children inside a DOMContainer
Wrong:
const dom = new DOMContainer();
dom.addChild(new Sprite(texture));
Correct:
const group = new Container();
group.addChild(dom, new Sprite(texture));
DOMContainer extends ViewContainer, which sets allowChildren = false. It is a leaf in the PixiJS scene graph. For PixiJS children, wrap the DOMContainer alongside them in a plain Container. For nested HTML, nest inside the element itself (element.appendChild(...)).
[LOW] Forgetting to set anchor for centered positioning
The default anchor is (0, 0), placing the element's top-left corner at the container's position. For centering a UI element on its scene-graph position, set anchor: 0.5:
const dom = new DOMContainer({ element: myElement, anchor: 0.5 });
dom.position.set(400, 300);
API Reference
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