---
title: "CanvasCompositing | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Interface CanvasCompositing

interface CanvasCompositing {  
    [globalAlpha](#globalalpha): number;  
    [globalCompositeOperation](#globalcompositeoperation): [GlobalCompositeOperation](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.GlobalCompositeOperation/);  
}

#### Hierarchy ([View Summary](https://docs.maptiler.com/sdk-js/api-reference/hierarchy/#Externals.CanvasCompositing))

-   CanvasCompositing
    -   [CanvasRenderingContext2D](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.CanvasRenderingContext2D/)
    -   [OffscreenCanvasRenderingContext2D](https://docs.maptiler.com/sdk-js/api-reference/interfaces/Externals.OffscreenCanvasRenderingContext2D/)

##### Index

### Properties[](#properties)

[globalAlpha](#globalalpha) [globalCompositeOperation](#globalcompositeoperation)

## Properties[](#properties-1)

### globalAlpha[](#globalalpha)

globalAlpha: number

[MDN Reference](https://developer.mozilla.org/docs/Web/API/CanvasRenderingContext2D/globalAlpha)

### globalCompositeOperation[](#globalcompositeoperation)

globalCompositeOperation: [GlobalCompositeOperation](https://docs.maptiler.com/sdk-js/api-reference/types/Externals.GlobalCompositeOperation/)

[MDN Reference](https://developer.mozilla.org/docs/Web/API/CanvasRenderingContext2D/globalCompositeOperation)