Be sure to view the source code.
This document uses different font-weight and font-style for the body, and headings, and strongly emphasized text. They are specified using style rules. The strongly emphasized text and headings are also not shown in boldface because the properties have been given new values. The headings are larger because it is part of the browser's default styles.
body {font-weight: bold} h1 {font-weight: normal} h2 {font-weight: normal} strong {font-weight: normal; font-style: italic}