Google's John Mueller said when it comes to PDFs on your site, you don't have to worry about the core web vitals scores or if they are mobile friendly. John said on Twitter "Yeah, we essentially ignore PDFs when it comes to Core Web Vitals & mobile-friendliness. Sometimes they show up in the reports, but there's no need to do anything specific with them."...
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Google: We Ignore PDFs For Core Web Vitals & Mobile Friendlessness
seroundtable.com