2D canvas opacity
Limited availability
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.
Learning resources on MDN
Browser support
- Chrome 32 Released on 2014-01-14
- Chrome Android 32 Released on 2014-01-15
- Edge ≤79 Released before 2020-01-15
- Firefox 30 Released on 2014-06-10
- Firefox for Android 30 Released on 2014-06-10
- Safari ❌
- Safari on iOS ❌
Baseline availability blocked since January 2020 by Safari (59 months)
Specifications
- HTML Standard (#concept-canvas-alpha), from HTML Workstream (WHATWG).