What is the VM prefix in the initiator column in Chrome Dev Tools Network Tab?

Question

In the Chrome Developer Tools Network Tab Initiator Column, sometimes a script has an Initiator which is prefixed with a VM.

My first thoughts are that this stands for Virtual Machine but what do the numbers then stand for?

If I click to view the source, it is still not clear to me what the origin of this script is?

Answer 1

It happens when the JavaScript code does not refer to some normally loaded JS file. For example when the code was executed with "eval". The number has no meaning.

Have a look at this StackOverflow thread for more information.