HTML 5 is slated to replace HTML 4 and XHTML 1.0 by sometime in 2014. In other words, HTML5 will become a Web Standard (Web Recommendation) in 2014.
However, you will notice that Expression Web 4 now has a Doctype for HTML5. And recently, Microsoft released 2 Updates for Expression Web 4. One of them adds support for HTML5 Intellisense. Yet, you still need a working knowledge of HTML5 to understand what Intellisense is showing you.
Stay Up to Date with HTML5 Browser Support.. Go to haz.io and view what your browser supports.
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To use the HTML 5 Doctype, Click Tools - Choose Page Editor Options -- Choose the Authoring Tab. Look at the drop down menu under "Doctype & Secondary Shema" as shown below. Choose a Doctype and then set the Secondary Schema so that it matches the Doctype.
Different Doctypes in Expression Web 4
With HTML5, there is only one Doctype to choose from. This will drastically simplify things. And, you can begin using the HTML5 Doctype right now.
HTML 5 Doctype is written as follows:
Note: the html tag can be written as <html lang="en"> which specifies the language as English. However, Expression Web will indicate the language as follows:
<meta content="en-us" http-equiv="Content-Language">
You can delete the above meta tag. But be sure to include the charset (character set) as specified below.
The purpose of the HTML5 doctype is solely meant to trigger standards mode. Standards mode is a web browser rendering mode. More on this later.