From http://www.w3schools.com (Copyright Refsnes Data)

HTML 5 <tt> tags


Definition and Usage

The <tt> tags defines teletype text. Not supported in HTML 5. Use CSS instead.


Differences Between HTML 4.01 and HTML 5

The <tt> element is no longer supported in HTML 5.


Tips and Notes

Tip: Use CSS to style elements.


Example

Source Output
<tt>Teletyped text</tt> Teletyped text


From http://www.w3schools.com (Copyright Refsnes Data)