How to use the Changes panel to track changes in CSS and JS files?

The Changes panel in developer tools is designed to help developers visualize all source code modifications made directly in the browser. This eliminates the need to constantly copy modified code from the inspector back to the text editor and prevents the loss of important edits if the page is accidentally refreshed.

To open this panel, open the command menu using the control shortcut, start typing the phrase Show Changes, and select the corresponding item. After that, a list of all files modified during the current debugging session will open at the bottom of the screen or in a separate panel.

Inside the Changes panel, a classic version comparison interface is displayed, similar to version control systems. Deleted lines are highlighted in red, and added lines in green. This makes it easy to control every style or script change before transferring them to the project's actual codebase.

This approach significantly speeds up the process of interactive layout and hypothesis testing. You can experiment with the design directly in the browser and then know precisely which style lines need to be updated in the project's source files.