Posted by Andrew.
Now that Web Inspector is functioning out-of-process over the serialized-message-channel, attaching Web Inspector window to the remote browser is possible. Here is an example of the remote debugging session using Chrome:
Under the hood, Web Inspector front-end is talking to the browser backend by means of the Remote Debugging Protocol. This protocol is based on the JSON-RPC 2.0 specification. It is bidirectional: clients send asynchronous requests to the server, server responds to these requests and/or generates notifications. More details about Remote Debugging Protocol, please visit the document of WebKit Remote Debugging.
How to remote debug with Chrome developer tools