There are seven non-attribute selectors:
- Universal Selector.
- * {font-weight: bold;}
- Type Selector.
- p {font-weight: bold;}
- Descendent Selector.
- p em {font-weight: bold;}
- Class Selector.
- p.heavy {font-weight: bold;}
- ID Selector.
- p#heavy {font-weight: bold;}
- Child Selector.
- ul > li {font-weight: bold;}
- Adjascent Sibling Selector.
- p + ul {font-weight: bold;}
