Introduction to HTML/XHTML

# XHTML and other Namespaces

• Although it is not strictly conforming, XHTML can include other namespaces.
• For example, in order to get something like $\int {e}^{x}\mathrm{dx}={e}^{x}$ you would use
```<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<title>A Math Example</title>