Re: [w3ctag/design-reviews] Review OffscreenCanvas, including ImageBitmapRenderingContext (#141)

The current thinking is that the performance and latency of transferToImageBitmap / transferFromImageBitmap will be OK for multithreaded content which absolutely has to perform updates in sync with the DOM.

We want to gain experience with both this and the commit()-based rendering style which is fully decoupled from DOM updates. I don't see a good way to change commit() to make it optionally, implicitly, sync up with DOM updates on the main thread.

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