browsingContext.domContentLoaded event

Event data

The params field in the event notification is an object with the following fields:

context

A string that contains the ID of the context in which the HTML document is being parsed.

navigation

A string that contains the UUID that uniquely identifies this navigation. If the navigation was started using the browsingContext.navigate or browsingContext.reload command, this ID matches the navigation value in the command's response. The same ID is shared by all events related to this navigation, including other navigation events in the browsingContext module and events in the network module.

timestamp

A non-negative integer that represents the time when the event was fired, as milliseconds elapsed since the epoch.

url

A string that contains the URL being loaded.

Description

In the lifecycle of a successful navigation, this event fires after browsingContext.navigationCommitted and before browsingContext.load events.

At this point, the HTML has been parsed, but subresources such as stylesheets and images may still be loading. This event is equivalent to the DOMContentLoaded event firing in the context.

If you set wait to "interactive" for the browsingContext.navigate and browsingContext.reload commands, they return as soon as browsingContext.domContentLoaded fires.

Examples

Receiving an event when a document is parsed

Assume you have a WebDriver BiDi connection and an active session with a subscription to browsingContext.domContentLoaded.

Suppose you use browsingContext.navigate to load https://example.com, passing the context ID you obtain from browsingContext.getTree.

The browser first fires browsingContext.navigationStarted and browsingContext.navigationCommitted events (you don't receive those notifications because the subscription in this example is only to browsingContext.domContentLoaded).

Once the HTML has been parsed, the browser sends the following notification, where the context value matches the context ID you passed to browsingContext.navigate:

{
  "type": "event",
  "method": "browsingContext.domContentLoaded",
  "params": {
    "context": "5e5e96e8-5247-4f22-9b35-a4a2d841cbaa",
    "navigation": "a1b2c3d4-5678-90ab-cdef-1234567890ab",
    "timestamp": 1782342489906,
    "url": "https://example.com"
  }
}

Specifications

Browser compatibility

See also

• browsingContext.navigationStarted event
• browsingContext.navigationCommitted event
• browsingContext.load event
• browsingContext.navigationFailed event