This HTML program is designed to detect and display the screen refresh rate (also known as screen frequency or frame rate) of a device's display in Hertz (Hz). It utilizes JavaScript to measure the time it takes for frames to render on the screen and calculates the frame rate based on that. The program includes a line chart to visualize the detected refresh rate over time and allows users to adjust the update frequency of the measurements with buttons. Additionally, it provides a real-time display of the current refresh rate measurement along with the corresponding timestamp. This tool can be useful for monitoring the performance of displays and assessing the smoothness of animations and visual content.