Chrome Developer Tools. Chrome DevTools Protocol - version 1-2 - Debugger domain. functionName string. The Chrome DevTools provide an amazing set of tools to help you develop on the Web platform. Here are a few tips you might not know yet. Chrome F12 tools can claim snafus exist when none occur on the actual mobile devices. There are 2 basic types of objects that the Developer Tools understand: Events These events will only be received by you; The are events triggered by page events, network events, the DOM, or something else.