The online event is fired when the browser has gained access to the network and the value of navigator.onLine switched to true.
  Note: That event shouldn't be used to determine the availability of a particular website. Network problems or firewalls might still prevent that website to be reached.
General info
- Specification
 - HTML5 Offline
 - Interface
 - Event
 - Bubbles
 - No
 - Cancelable
 - No
 - Target
 - 
    DefaultView (
<window>) - Default Action
 - None
 
Properties
| Property | Type | Description | 
|---|---|---|
target Read only  |  
    EventTarget |  
    The event target (the topmost target in the DOM tree). | 
type Read only  |  
    DOMString |  
    The type of event. | 
bubbles Read only  |  
    boolean |  
    Does the event normally bubble? | 
cancelable Read only  |  
    boolean |  
    Is it possible to cancel the event? |