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# Style Masks

Constants that specify panel styles.

## Topics

### Constants

[`static const NSWindowStyleMask NSDocModalWindowMask;`](/documentation/AppKit/NSDocModalWindowMask)

The panel is created as a modal sheet.

[`static const NSWindowStyleMask NSUtilityWindowMask;`](/documentation/AppKit/NSUtilityWindowMask)

The panel is created as a floating window.

[`static const NSWindowStyleMask NSNonactivatingPanelMask;`](/documentation/AppKit/NSNonactivatingPanelMask)

The panel can receive keyboard input without activating the owning app.

[`static const NSWindowStyleMask NSHUDWindowMask;`](/documentation/AppKit/NSHUDWindowMask)

The panel is created as a transparent panel (sometimes called a “heads-up display”).


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