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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/mozOpaque below:

HTMLCanvasElement: mozOpaque property - Web APIs

In this article Value

A boolean value.

Examples

Given this <canvas> element:

<canvas id="canvas" width="300" height="300" moz-opaque></canvas>

You can get or set the mozOpaque property. For example, you could conditionally set it to true if mimeType === 'image/jpeg', or similar, to gain performance in your application when translucency is not needed.

const canvas = document.getElementById("canvas");
console.log(canvas.mozOpaque); // true
// deactivate it
canvas.mozOpaque = false;
Specifications

Not part of any standard.

Browser compatibility

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See also

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