You can define the following sections of the HTML code of the master page. This code is used for all pages that inherit content from the master page:
•DOCTYPE - here you can enter any code that needs to be placed at the beginning of the file, typically the DOCTYPE definition
•HEAD - here you can put any HTML code that needs to be placed inside the <head> element of the page.
•BODY - here you can add custom attributes to the <body> element.
•Master page code - this is actually the HTML layout of the master page template. This is the same code that you can edit on the Design tab, by using the Edit layout () button.
Please be aware that the code between the editable sections is of informative character only and may not be identical to the actual rendered code.