The Web Console:

  1. Logs information associated with a web page: network requests, JavaScript, CSS, security errors and warnings as well as error, warning and informational messages explicitly logged by JavaScript code running in the page context
  2. Enables you to interact with a web page by executing JavaScript expressions in the context of the page

Opening the Web Console
How to start using the Web Console.
The command line interpreter
How to interact with a document using the Console.
Split console
Use the Console alongside other tools.
Console messages
Details of the messages the Console logs.
Rich output
See and interact with objects logged by the Console.
Keyboard shortcuts
Shortcut reference.