[kiitos]

But like, why not just use that ASCII sequence diagram directly?

    Renderer               Browser        Network
    ========               =======        =======
    | BeginNavigation      |              |  
    |--------------------->|              |  
    |                      | URLRequest   |
    |                      |------------->|
    |                      |              |
    |                      |  URLResponse |
    |                      |<-------------|
    |                      |
    |     CommitNavigation |
    |<---------------------|
    |                      |
    | DidCommitNavigation  |
    |--------------------->|
    |

This took me like 45 seconds to produce in Visual Studio Code.