This report analyzes the National Geographic website using Google Chrome's device simulator to evaluate its responsiveness based on nine key principles of responsive web design (RWD). The report explores the website's overview, features, positive and negative aspects, user reviews, and recommendations for improvement. It delves into the implementation of RWD principles, including the flow, relative units, breakpoints, minimum and maximum values, nested objects, desktop or mobile first approach, web fonts and system fonts, and bitmap or vector images. The report concludes with a summary of the website's responsiveness and suggests areas for enhancement.