wp-includes/class-wp-editor.php:1754Outputs the HTML for distraction-free writing mode.
public static function wp_fullscreen_html() { _deprecated_function( __FUNCTION__, '4.3.0' ); }Introduced in 3.2.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-editor.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.