wp-includes/theme.php:1383Displays the image markup for a custom header image.
$attrarrayoptionalarray()function the_header_image_tag( $attr = array() ) { echo get_header_image_tag( $attr );}Introduced in 4.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/theme.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.