new FullscreenButton(container, fullscreenElement)
        A single button widget for toggling fullscreen mode.
    
    
    
    
    
    
        
| Name | Type | Default | Description | 
|---|---|---|---|
| container | Element | String | The DOM element or ID that will contain the widget. | |
| fullscreenElement | Element | String | document.body | optional The element or id to be placed into fullscreen mode. | 
Throws:
- 
    DeveloperError : Element with id "container" does not exist in the document.
See:
Members
- 
    container :Element
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    Gets the parent container.
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    viewModel :FullscreenButtonViewModel
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    Gets the view model.
Methods
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    destroy()
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    Destroys the widget. Should be called if permanently removing the widget from layout.
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    isDestroyed() → Boolean
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    Returns:true if the object has been destroyed, false otherwise.
