An OffscreenCanvas could not be cloned because it was detached

Question

yesterday returned to my hobby with HTML canvas and tried to do a rendering in a separate thread, just to face the following error in the console:

Uncaugh

Answer 1

You should send OffscreenCanvas to worker only once:

worker.postMessage({canvas: offscreenCanvas}, [offscreenCanvas]);

while (dTime > timeProduct) {
    worker.postMessage({ posX, posY });
    dTime -= timeProduct;
}