src/vs/workbench/browser/parts/editor/editorGroupView.ts/EditorGroupView/updateContainer
class EditorGroupView:	private updateContainer(): void {

		// Empty Container: add some empty container attributes
		if (this.isEmpty) {
			this.element.classList.add('empty');
			this.element.tabIndex = 0;
			this.element.setAttribute('aria-label', localize('emptyEditorGroup', "{0} (empty)", this.label));
		}

		// Non-Empty Container: revert empty container attributes
		else {
			this.element.classList.remove('empty');
			this.element.removeAttribute('tabIndex');
			this.element.removeAttribute('aria-label');
		}

		// Update styles
		this.updateStyles();
	}