src/vs/base/browser/ui/keybindingLabel/keybindingLabel.ts/KeybindingLabel/renderKey
class KeybindingLabel:	private renderKey(parent: HTMLElement, label: string, highlight: boolean, separator: string): void {
		dom.append(parent, this.createKeyElement(label, highlight ? '.highlight' : ''));
		if (separator) {
			dom.append(parent, $('span.monaco-keybinding-key-separator', undefined, separator));
		}
	}