A Doctype is an instruction to the web browser about what version of HTML the page is written in. Select the appropriate Doctype for the site. Go to:
- Content -> Pages -> Options -> Setup
- Content -> Assets -> Options -> Setup
- Setup -> Site
- System -> Configuration
Select Site, and then Pages -> Standards:
1.Edit/configure:
Doctype
Select the required option.
All pages
Doctypes may be varied on a page by page basis. If required reset all pages to the default Doctype.