🔧 Browser vs Node — Where the Event Loop Actually Diverges (Part 2/3)

In part 1, we built the shared mental model: call stack, microtask queue, macrotask queue, and the rule that microtasks fully drain before the next macrotask runs. That model is spec-level JavaScript behavior — but it's not the whole story once you actually run code.

The event loop isn't part of the JS language spec. It's part of the host...