wp-includes/link-template.php:2133Displays relational links for the posts adjacent to the current post for single post pages.
function adjacent_posts_rel_link_wp_head() { if ( ! is_single() || is_attachment() ) { return; } adjacent_posts_rel_link();}Introduced in 3.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/link-template.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.