React uses Object.defineProperty to add setters on the value property of <input> DOM elements. React expects non-programmatic "real" actions in the browser not to trigger these setters. We have to be extra careful that mutations from follower to leader don't cause these setters to fire. This page sets up a test that will fail if such a setter is ever called. To use this test, simply try typing in the input field below. It will turn red if the setter is ever triggered.

Failed!

Setter was called!