This specifies the type of box that an element will produce. Display applies to all elements, has an initial value of inline and is not inherited. IE 3 does not support display. IE 4 on the PC does not support display except for none. IE 5 supports block, inline and none.
Opera supports block, none and inline.
IE 4 on the Mac supports none. Netscape only supports none usably. As a result, if they are wider than one line, they will be forced to act as block elements. Otherwise it is treated as a block element. A run-in heading A P element Height Height is principally used to specify the height of block and replaced elements.