wp-includes/feed.php:628Displays Site Icon in atom feeds.
function atom_site_icon() { $url = get_site_icon_url( 32 ); if ( $url ) { echo '<icon>' . convert_chars( $url ) . "</icon>\n"; }}Introduced in 4.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/feed.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.