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Showing content from https://playwright.dev/java/docs/api/class-cdpsession below:

CDPSession | Playwright Java

The CDPSession instances are used to talk raw Chrome Devtools Protocol:

• protocol methods can be called with session.send method.
• protocol events can be subscribed to with session.on method.

Useful links:

• Documentation on DevTools Protocol can be found here: DevTools Protocol Viewer.
• Getting Started with DevTools Protocol: https://github.com/aslushnikov/getting-started-with-cdp/blob/master/README.md

CDPSession client = page.context().newCDPSession(page);
client.send("Runtime.enable");

client.on("Animation.animationCreated", (event) -> System.out.println("Animation created!"));

JsonObject response = client.send("Animation.getPlaybackRate");
double playbackRate = response.get("playbackRate").getAsDouble();
System.out.println("playback rate is " + playbackRate);

JsonObject params = new JsonObject();
params.addProperty("playbackRate", playbackRate / 2);
client.send("Animation.setPlaybackRate", params);

Detaches the CDPSession from the target. Once detached, the CDPSession object won't emit any events and can't be used to send messages.

Usage

Returns

• void#

Unregister an event handler for events with the specified event name. The given handler will not be called anymore for events with the given name.

Usage

CDPSession.off(eventName, handler);

Arguments

• eventName String#

  CDP event name.

• handler Consumer<JsonObject>#

  Event handler.

Register an event handler for events with the specified event name. The given handler will be called for every event with the given name.

Usage

CDPSession.on(eventName, handler);

Arguments

• eventName String#

  CDP event name.

• handler Consumer<JsonObject>#

  Event handler.

Usage

CDPSession.send(method);
CDPSession.send(method, args);

Arguments

• method String#

  Protocol method name.

• args JsonObject (optional) Added in: v1.37#

  Optional method parameters.

Returns

• JsonObject#

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