The checking event is fired when the user agent is checking for an update, or attempting to download the cache manifest for the first time.
| Property | Type | Description |
target |
EventTarget (DOM element) | The event target (the topmost target in the DOM tree). Read Only. |
type |
string | The type of event. Read only. |
canBubble |
boolean | Does the event normally bubble? Read only. |
cancelable |
boolean | Is it possible to cancel the event? Read only. |