Support » Plugin: AMP » Error After Update from Webmaster Tools
4 months, 2 weeks ago
None of my pages validate now
“The attribute ‘prefix’ may not appear in tag ‘html ⚡ for top-level html’.”
Can you share the AMP URL for one of your posts? There is likely another plugin or your theme that is inserting the prefix attribute to the html tag via the language_attributes filter.