src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts/NotebookEditorWidget/updateShadowElement
class NotebookEditorWidget:	private updateShadowElement(shadowElement: HTMLElement) {
		const containerRect = shadowElement.getBoundingClientRect();

		this._shadowElement = shadowElement;
		this._shadowElementViewInfo = {
			height: containerRect.height,
			width: containerRect.width,
			top: containerRect.top,
			left: containerRect.left
		};
	}