/wp-content/themes/twentythirteen/inc/

	Up one level
	back-compat.php    [source] [83 lines]	Twenty Thirteen back compat functionality Prevents Twenty Thirteen from running on WordPress versions prior to 3.6, since this theme is not meant to be backward compatible and relies on many new functions and markup changes introduced in 3.6.
	block-patterns.php [source] [170 lines]	Block Patterns
	custom-header.php  [source] [236 lines]	Implement a custom header for Twenty Thirteen