Block elements are HTML elements that by default are displayed as a block in the page flow.

Normally, if no styles change the default behaviour, elements of the following types are considered block elements:

• ADDRESS
• BLOCKQUOTE
• BODY
• DD
• DIV
• DL
• DT
• FIELDSET
• FORM,
• FRAME
• FRAMESET
• H1, H2, H3, H4, H5, H6
• IFRAME
• NOFRAMES
• OBJECT
• P
• OL, UL, LI
• APPLET
• CENTER
• DIR
• HR
• MENU
• PRE

Additionally, TABLE, TR, THEAD, TBODY, TFOOT, COL, COLGROUP, TD, TH and CAPTION are to be considered block-level elements, although they use special values for their display attributes. More detailed info available through the CSS spec.

See also Inline Elements.