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Echo the doctype and opening markup.
If you are going to replace the doctype with a custom one, you must remember to include the opening <html> and <head> elements too, along with the proper attributes. It would be beneficial to also include the <meta> tag for content type. The default doctype is XHTML v1.0 Transitional, unless HTML support os present in the child theme.
File name: genesis/lib/structure/header.php