wp-includes/customize/class-wp-customize-background-position-control.php:32Don't render the control content from PHP, as it's rendered via JS on load.
public function render_content() {}Introduced in 4.7.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/customize/class-wp-customize-background-position-control.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.