Gagan's response lacks depth and relevance to the question about HTML/HTML5 elements. Mentioning only the <marquee> tag, which is outdated and not recommended for use, shows a lack of understanding of modern HTML practices. The benchmark response highlights the importance of semantic tags like <header>, <nav>, and <footer> for structuring webpages effectively, which Gagan failed to mention. A better response would have included the use of semantic tags to enhance webpage structure and accessibility.