This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
HTMLCanvasElement.mozOpaque property is
Boolean reflecting the
attribute of the
<canvas> element. It lets the canvas know whether or
not translucency will be a factor. If the canvas knows there's no translucency, painting
performance can be optimized.
This has been standardized as setting the
alpha option to
false when creating a drawing context with
HTMLCanvasElement.getContext(). Use of
mozOpaque should be
avoided. Firefox will stop supporting it in the future.
var opaque = canvas.mozOpaque; canvas.mozOpaque = true;
<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
mimeType == 'image/jpeg', or
similar, to gain performance in your application when translucency is not needed.
var canvas = document.getElementById('canvas'); console.log(canvas.mozOpaque); // true // deactivate it canvas.mozOpaque = false;
Not part of any standard.
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