Diagnostics of state transitions

A system to diagnose computer readable instructions, the system comprising:

• memory to store a set of instructions;
• and
• a processor to execute the set of instructions to:
• retrieve diagnostic information regarding runtime origin of a later-manifested runtime artifact of a logical operation providing an event handler for a Document Object Model at a selected point in the computer readable instructions, the diagnostic information being associated with a state transition of a unit of execution within a logical operation logged during the runtime of an object the computer readable instruction into an instance of the object via the exception handler.

A computer readable storage device to store computer executable instructions to control a processor to control an arena-based memory, the instructions comprising:

• log a state transition of a unit of execution within a logical operation providing an event handler for a Document Object Model during runtime of an object of the computer readable instructions into an instance of the object;
• associate diagnostic information regarding runtime origin of a later-manifested runtime artifact of the logical operation with the state transition;
• and
• provide the state transition and associated diagnostic information for retrieval at a selected point in the computer readable instructions.