In 2018, the compatibility of multimedia formats across different web browsers was a critical consideration for web developers aiming to create engaging and visually appealing websites. The text outlines various multimedia formats, such as WebM, Ogg Theora Vorbis, Ogg Opus, MP4, and others, highlighting their compatibility with major browsers including Firefox, Chrome, Safari, and Internet Explorer. It emphasizes the importance of choosing the right codecs, like H.264 and AAC, to ensure seamless multimedia experiences, while noting the limitations and lack of support in some browsers. Animations have become a staple in modern web design, with the decline of Flash paving the way for new technologies like CSS, HTML5, and JavaScript to enable richer animations. The text concludes by stressing the necessity of understanding browser compatibility and leveraging supported multimedia formats to enhance user engagement and satisfaction.