p font: message-box;
<!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'> <head> <title>system fonts</title> <style type='text/css'> p#message-box { font: message-box; } </style> </head> <body> <p id='message-box'> This is the message-box font. </p> </body> </html>