NSClosableWindowMask The window displays a close button. Declarationstatic const NSWindowStyleMask NSClosableWindowMask; See AlsoDeprecatedNSBorderlessWindowMaskNSTitledWindowMaskNSMiniaturizableWindowMaskNSResizableWindowMaskNSTexturedBackgroundWindowMaskNSUnifiedTitleAndToolbarWindowMaskNSFullScreenWindowMaskNSFullSizeContentViewWindowMaskNSUnscaledWindowMask