Visual Inspector is a Chrome plugin designed to assist front-end engineers and designers in quickly identifying differences between design mockups and web pages. It also serves as a self-examination tool for front-end engineers, reducing the need for extensive communication with designers.

With Visual Inspector, you have the ability to modify the size, position, transparency, and mix mode of design mockups, making it easy to compare various design styles. This is particularly useful during page refactoring, as the real-time function allows you to easily restore the state of the design draft before refreshing the page.

To prevent accidental movement of the design, the freeze function can be enabled, disabling mouse events on the mockup. This ensures that the design does not interfere with the interactive functionality of the page itself.

Additionally, Visual Inspector provides preset shortcuts for frequently used commands, making operation and comparison more efficient.

Please note that the latest version+) no longer includes the ruler functionality. Users in need of this feature can install a ruler plugin such as "Better Ruler," which supports snapping elements.

Overall, Visual Inspector is a valuable tool for front-end engineers and designers, streamlining the development process and improving visual inspection capabilities.