To create a responsive website, developers need to consider some technical issues, such as determining breakpoints, determining the number of columns in the grid, calculating the width of each column and other problems. which appear from the design phase. Usually, rather than creating responsive websites from scratch and to avoid "reinventing the wheel", developers use frameworks to simplify the design process. Web developers can choose between many responsive frameworks. Nowadays, the most popular and comprehensive frameworks are Bootstrap, Foundation and Skeleton. Responsive frameworks offer configurable features such as form sets, icons and buttons, stylized typography and other built-in components that provide alerts, navigation, popovers, HTML templates, image frames and much more. Table 2: Comparison of Most Popular Responsive Frameworks Bootstrap Foundation SkeletonDescription “Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive and mobile projects on the web. » “The world’s most advanced responsive front-end framework.” “A very simple and responsive template.” Popularity 89,300 stars on GitHub 21,640 stars on GitHub 10,247 stars on