Web platform features explorer

2D canvas opacity

Limited availability
Tags: api Groups: Canvas

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.

Specifications

Browser support

  • Chrome 32 Released on 2014-01-14
  • Chrome Android 32 Released on 2014-01-15
  • Edge 79 Released on 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 (66 months)

Usage (according to Chrome Platform Status)

~41.323% of page loads. More data at chromestatus.