A and developer creates and modifies the structure and style of web pages. They use to build the basic framework of the website, defining elements like headers, body content, and links. With , they control the layout, colors, fonts, and animations, ensuring the website is visually appealing and user-friendly. They also ensure the website is responsive, meaning it adjusts to different screen sizes and devices. Additionally, they may work on site accessibility, SEO optimization, browser compatibility, and perform testing and debugging. They often collaborate with other developers and designers to create a cohesive and functional website.