feat: add documentation (#8593)

docs/api/puppeteer.eventemitter.on.md

@@ -0,0 +1,28 @@
+---
+sidebar_label: EventEmitter.on
+---
+
+# EventEmitter.on() method
+
+Bind an event listener to fire when an event occurs.
+
+**Signature:**
+
+```typescript
+class EventEmitter {
+  on(event: EventType, handler: Handler): EventEmitter;
+}
+```
+
+## Parameters
+
+| Parameter | Type                                  | Description                                                        |
+| --------- | ------------------------------------- | ------------------------------------------------------------------ |
+| event     | [EventType](./puppeteer.eventtype.md) | the event type you'd like to listen to. Can be a string or symbol. |
+| handler   | [Handler](./puppeteer.handler.md)     | the function to be called when the event occurs.                   |
+
+**Returns:**
+
+[EventEmitter](./puppeteer.eventemitter.md)
+
+`this` to enable you to chain method calls.