This example presents a functional digital stopwatch interface built with React. It displays elapsed time in hours, minutes, seconds, and milliseconds within a text input field. Three buttons control the timer: start, stop, and reset. The implementation uses JavaScript's `setInterval` and `clearInterval` to update the display every 50 milliseconds, incrementing time values and handling carry-over between units. The interface is rendered as plain HTML elements with inline event handlers, showing a simple interactive time-tracking tool without external data sources.