The toggle event is fired when the open state of a <details> element is toggled.
Eventopen state of the <details> element.| Property | Type | Description | 
|---|---|---|
| targetRead only | EventTarget | The event target (the topmost target in the DOM tree). | 
| typeRead only | DOMString | The type of event. | 
| bubblesRead only | Boolean | Whether the event normally bubbles or not. | 
| cancelableRead only | Boolean | Whether the event is cancellable or not. | 
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    https://developer.mozilla.org/en-US/docs/Web/Events/toggle