8.2. Styling Heading Elements

Headings present different margin behavior than most block elements, which makes their composition one of the more annoying tasks stylists face.

8.2.1. Heading Sizes and Type Treatments

Almost every high-value design is going to specify heading sizes that differ from the user agent defaults, in no small part because—let’s face it—the user agent styles for headings make them universally big and ugly.