What's so special in web sockets messages displayed with a green background in Chrome?

Question

Looking at web sockets at Stack Exchange, I notice that some messages are displayed with a green background in Chrome:

What's so special in those messages? What are they?

Answer 1

The green background ones are frames (messages) sent to the server. The white background are the ones received from the server.

Messages are color-coded according to their type:

• Outgoing text messages are light-green.
• Incoming text messages are white.
• WebSocket opcodes are light-yellow.
• Errors are light-red.

Source