It’s not part of the spec, apparently, but Adobe discusses it at https://helpx.adobe.com/acrobat/kb/link-html-pdf-page-acrobat.html https://helpx.adobe.com/acro

It’s not part of the spec, apparently, but Adobe discusses it at https://helpx.adobe.com/acrobat/kb/link-html-pdf-page-acrobat.html https://helpx.adobe.com/acrobat/kb/link-html-pdf-page-acroba....