src/vs/workbench/browser/parts/statusbar/statusbarPart.ts/StatusbarPart/doCreateStatusItem
class StatusbarPart:	private doCreateStatusItem(id: string, alignment: StatusbarAlignment, ...extraClasses: string[]): HTMLElement {
		const itemContainer = document.createElement('div');
		itemContainer.id = id;

		itemContainer.classList.add('statusbar-item');
		if (extraClasses) {
			itemContainer.classList.add(...extraClasses);
		}

		if (alignment === StatusbarAlignment.RIGHT) {
			itemContainer.classList.add('right');
		} else {
			itemContainer.classList.add('left');
		}

		return itemContainer;
	}