Z-index Visualizer is a free Chrome add-on developed by jeong57281 that provides a helpful solution for visualizing the stacking contexts of web pages. With the concept of stacking context in CSS, there are situations where achieving the desired result may be challenging, regardless of the z-index value.

This tool offers a 2.5D visualization of the stacking context, allowing users to quickly identify the elements on which the current stacking context depends. By visually representing the stacking context, web developers can gain a better understanding of how different elements on their page are layered and positioned.

Z-index Visualizer is a valuable resource for web developers who want to troubleshoot and optimize the stacking order of elements on their web pages. It helps them identify any conflicts or issues that may arise due to the stacking context concept in CSS.

Please note that the Z-index Visualizer is available as a Chrome extension and can be downloaded from the developer's GitHub page.