Some WebP/AVIF used but no fallback for older browsers

WebP and AVIF are modern image formats that load faster than JPEG or PNG. The HTML picture element lets you offer a modern format with a traditional format as a backup for older browsers. Without a fallback, visitors using older browsers (such as older Safari or Internet Explorer) may see broken images instead of your content. Wrap WebP or AVIF image tags in a picture element and include a JPEG or PNG source as the fallback option.