The title attribute for the WordPress featured post has been removed for a while, but you can get it back with the wp_get_attachment_image_attributes filter which can add the HTML attribute markup back in, add to your functions.php file…
add_filter( 'wp_get_attachment_image_attributes', 'tl_add_img_title', 10, 2 );
// Add title attribute to featured image
function tl_add_img_title( $attr, $attachment = null){
$attr['title'] = get_post( $attachment->ID )->post_title;
return $attr;
}
The title attribute was removed due to accessibility issues – however is some instances you may need it for lightbox overlay purposes.
