src/vs/base/browser/ui/keybindingLabel/keybindingLabel.ts/KeybindingLabel/createKeyElement
class KeybindingLabel:	private createKeyElement(label: string, extraClass = ''): HTMLElement {
		const keyElement = $('span.monaco-keybinding-key' + extraClass, undefined, label);
		this.keyElements.add(keyElement);

		return keyElement;
	}