wp-includes/style-engine/class-wp-style-engine-css-rule.php:137Gets the declarations object.
WP_Style_Engine_CSS_Declarations public function get_declarations() { return $this->declarations; }Introduced in 6.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/style-engine/class-wp-style-engine-css-rule.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.