Limited Availability Canvas

2D canvas opacity

The optional alpha parameter of a 2D canvas's getContext() method sets whether the canvas has an alpha transparency channel. If set to false, then this permits the browser to optimize compositing for an opaque canvas.

Baseline Status: This feature is currently Limited (not yet Baseline). Latest engine implementation shipped on Jan 15, 2020.

Desktop Browser Engine Support

Google Chrome

32

Supported

Mozilla Firefox

30

Supported

Apple Safari

—

Unsupported

Microsoft Edge

79

Supported

Mobile Browser Engine Support

Chrome Android

32

Firefox Android

30

Safari iOS

—

Specifications and References

Specification ↗ Feature XML ↗

MDN Browser Compat Data Keys:

api.HTMLCanvasElement.getContext.2d_context.options_alpha_parameter ↗