9. This website uses cookies to improve your experience. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. The !DOCTYPE declaration is case insensitive, so it can also be input as !doctype and includes the type of document. In HTML5, there is no need to … The declaration is an instruction to the web browser about what version of HTML the page is written in. A simple one is sufficient. Which attribute for 9. This website uses cookies to improve your experience. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. The !DOCTYPE declaration is case insensitive, so it can also be input as !doctype and includes the type of document. In HTML5, there is no need to … The declaration is an instruction to the web browser about what version of HTML the page is written in. A simple one is sufficient. Which attribute for