1866551 - Implement Canvas 2D layer API

Status: UNCONFIRMED

(Core :: Graphics: Canvas2D, enhancement)

Description

[Jean-Philippe Gravel]

Expected results:

Gecko should support the new Canvas 2D layer API.

High level feature explainer:
https://github.com/fserb/canvas2D/blob/master/spec/layers.md

The specification change discussion:
https://github.com/whatwg/html/issues/8476

Spec change pull request:
https://github.com/whatwg/html/pull/9537

WPT tests are available here:

• https://github.com/web-platform-tests/wpt/tree/master/html/canvas/element/layers
• https://github.com/web-platform-tests/wpt/tree/master/html/canvas/offscreen/layers