wp-includes/class-wp-customize-panel.php:240Checks required user capabilities and whether the theme has the feature support required by the panel.
bool public function check_capabilities() { if ( $this->capability && ! current_user_can( $this->capability ) ) { return false; } if ( $this->theme_supports && ! current_theme_supports( ...(array) $this->theme_supports ) ) { return false; } return true; }Introduced in 4.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-customize-panel.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.