This tag tells the browser that it's an HTML document. It represents the root of any HTML document.
<html> tag is the container for all other HTML elements (except for the
<!DOCTYPE HTML> <html> </html>
For a better accessibility, it's important to fill in the document language in the "lang" attribute of the
<!DOCTYPE HTML> <html lang="en"> </html>
Potentially, this tag may evolve during the patches to be applied for optimal display on Outlook 120 DPI. We will add an XML namespace. For Outlook, we'll use the properties to use with Microsoft Office applications:
<html lang="en" xmlns="http://www.w3.org/1999/xhtml" xmlns:o="urn:schemas-microsoft-com:office:office">