Block-Level
Block-level elements are those that generate an element box that (by default) fills its parent element’s content area and cannot have other elements to its sides. In other words, block-level elements generate “breaks” before and after the element box. The most familiar block elements from HTML are p and div. Replaced elements can be block-level elements but usually are not.
List items are a special case of block-level elements. In addition to behaving in a manner consistent with other block elements, they generate a marker—typically a bullet for unordered lists or a number for ordered lists—which is “attached” to the element box. Except for the presence of this marker, list items are identical to other block elements.
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