src/vs/base/browser/ui/scrollbar/scrollableElement.ts/AbstractScrollableElement/updateClassName
class AbstractScrollableElement:	public updateClassName(newClassName: string): void {
		this._options.className = newClassName;
		// Defaults are different on Macs
		if (platform.isMacintosh) {
			this._options.className += ' mac';
		}
		this._domNode.className = 'monaco-scrollable-element ' + this._options.className;
	}