<!DOCTYPE html> <html> <head> <style> h3 { display: block; font-size: 1.17em; margin-top: 1em; margin-bottom: 1em; margin-left: 0; margin-right: 0; font-weight: bold; } </style> </head> <body> <p>An h3 element is displayed like this:</p> <h3>This is heading 3</h3> <p>Change the default CSS settings to see the effect.</p> </body> </html>