HTML Rules Of Nesting

Nesting in common in HTML, there are four main rules  to remember about nesting :

1. Element just be completely nested and not closed is the worng order .For Example,<b><i> just on example </i></b>.
2. Text level element may be nested within blocked-level element or other text-level element.
3. Block-Level element may be nested within or other block-level element.
4. Block-Level  element may not be nested in text-level element.