<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Sample XHTML page</title> </head> <body> <p class="para"> This is a sample paragraph. </p> </body> </html> Root element: Number of elements: Has DOCTYPE: Parse time: (try pasting larger strings of XML to see effect on parse time.)