Hi all, I've spent the last month or so 'finishing' the implementation of OffscreenCanvas[1], based on Žan Doberšek's work from a year ago[2]. OffscreenCanvas is an API for being able to use canvas drawing without a visible canvas, and from within Workers. It's supported by Blink and has partial support in Gecko. It's at the point now where I'd consider it a finished draft - it is almost fully implemented and passes the majority of relevant tests in a debug build without crashing, but has some areas that need completion on other platforms (async drawing on non-Linux) and some missing parts (Web Inspector, ImageBitmapRenderingContext). It almost certainly needs reworking in places. My work is on GitHub[3] - I'd like to solicit reviews and comment. Some of the bugs hanging off [2] have patches that need review and I think are near ready to being landable as the foundation of this work. It is broadly split up like so: - Refactor to move functionality from HTMLCanvasElement to CanvasBase - Refactor to not unnecessarily require HTMLCanvasElement in places - Implement OffscreenCanvas functionality - Make font loading/styling usable from a Worker and without a Document - Implement AnimationFrameProvider on DedicatedWorkerGlobalScope - Implement asynchronous drawing updates on placeholder canvases I expect the font-related stuff to be the most contentious, and my AnimationFrameProvider implementation may be too trivial (but might be ok for a first go?) All feedback appreciated. Best regards, Chris [1] https://html.spec.whatwg.org/multipage/canvas.html#the-offscreencanvas-inter... [2] https://bugs.webkit.org/show_bug.cgi?id=183720 [3] https://github.com/Cwiiis/webkit/tree/offscreen-canvas