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.
Why this matters
Without a fallback, visitors using older browsers (such as older Safari or Internet Explorer) may see broken images instead of your content.
How to fix it
Wrap WebP or AVIF image tags in a picture element and include a JPEG or PNG source as the fallback option.
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