HTML警察 is a free Chrome add-on designed to help web designers and coders detect common HTML coding mistakes in real time. This tool identifies issues such as unclosed tags, incorrect structures within

elements, missing alt attributes in tags, and the absence of type attributes in tags. It is particularly useful for beginners in front-end development who aim to ensure the correctness and accessibility of their HTML coding.

Additionally, HTML警察 allows users to upload design data from local files, enabling them to compare the coded output with design specifications. Users can adjust opacity and image size using a scrollbar, ensuring that the front-end coding aligns with the intended design. This feature enhances the overall workflow for web designers by providing immediate visual feedback on their coding practices.