Takuro Sugahara

Is there a way to do [this](https://github.com/niklasvh/html2canvas/blob/master/src/render/canvas/canvas-renderer.ts#L890) using a web worker? I'm using a document [here](https://github.com/niklasvh/html2canvas/blob/master/src/render/canvas/canvas-renderer.ts#L562), so it can't be processed by a web worker. (document cannot be used because...