` and is of type ``. See its doc page for styling
options.
In addition, `with-backdrop` will wrap the focus within the content in the light DOM.
Override the [`_focusableNodes` getter](#Polymer.IronOverlayBehavior:property-_focusableNodes)
to achieve a different behavior.
### Limitations
The element is styled to appear on top of other content by setting its `z-index` property. You
must ensure no element has a stacking context with a higher `z-index` than its parent stacking
context. You should place this element as a child of `` whenever possible.
@demo demo/index.html
@polymerBehavior
*/
Polymer.IronOverlayBehavior = [Polymer.IronFitBehavior, Polymer.IronResizableBehavior, Polymer.IronOverlayBehaviorImpl];
/**
* Fired after the overlay opens.
* @event iron-overlay-opened
*/
/**
* Fired when the overlay is canceled, but before it is closed.
* @event iron-overlay-canceled
* @param {Event} event The closing of the overlay can be prevented
* by calling `event.preventDefault()`. The `event.detail` is the original event that
* originated the canceling (e.g. ESC keyboard event or click event outside the overlay).
*/
/**
* Fired after the overlay closes.
* @event iron-overlay-closed
* @param {Event} event The `event.detail` is the `closingReason` property
* (contains `canceled`, whether the overlay was canceled).
*/
})();