Web features explorer

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.

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 Not supported
  • Safari on iOS Not supported

Baseline availability blocked since January 2020 by Safari (78 months)

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MDN documentation

Specifications

Web Platform Tests (WPT)

View the latest WPT test results for this feature

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