Checks whether a custom header is set or not.

Checks whether a header image is set or not.

Checks whether a header video is set or not.

Displays header image URL.

Displays the custom header text color in 3- or 6-digit hexadecimal form (minus the hash symbol).

Whether a child theme is in use.

Whether the site is being previewed in the Customizer.

Checks whether the custom header video is eligible to show on the current page.

Checks if random header image is in use.

Displays localized stylesheet link element.