Chrome's Code Coverage feature, previously available only in Chrome Canary, has now been integrated into the standard Chrome browser, allowing developers to efficiently identify and optimize unused JavaScript and CSS code in their web applications. By running a web app, users can visualize which lines of code are executed and which remain inactive, with a color-coded bar indicating the proportion of active versus inactive code. This tool is especially beneficial for managing CSS code, which can accumulate over time, and provides a clear overview to help developers streamline their codebases. Code coverage works by recording interactions with a web page, then analyzing and displaying the results, making it easier to pinpoint inefficiencies. Though JavaScript build systems like webpack can handle dead JS code, managing unused CSS is notably more challenging, and this feature presents a practical solution for ongoing code optimization. Developers can download the latest version of Chrome or wait for the feature to be rolled out to regular users, and they are also encouraged to consider using LogRocket for error tracking and further integration with their development stack.