Page DOM Stats is a free Chrome extension developed by Eugene Lazutkin. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This extension allows users to gather statistics on the Document Object Model (DOM) and Cascading Style Sheets (CSS) of web pages.

With Page DOM Stats, users can easily inspect performance-related properties of a web page. It provides information on the DOM size, including the total number of DOM nodes, the maximum number of children, the maximum depth, and the total number of scripts. Additionally, it provides details on the CSS size, such as the total number of style sheets, the total number of rules, the total number of selectors, the maximum number of rules, and the maximum number of selectors.

This extension is a valuable tool for web developers and designers who need to analyze the structure and performance of web pages. By providing detailed statistics on the DOM and CSS, Page DOM Stats helps users identify potential bottlenecks and optimize their websites for better performance.

Overall, Page DOM Stats is a useful Chrome extension that provides valuable insights into the DOM and CSS of web pages, helping users improve the performance of their websites.