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spacing = ...

Specifies the margin of clear space to be left around the entire outside of the markup element (i.e. all four sides at once).

Specifying a distance value for this field

This field takes a distance value specified with either one or two value elements.

If the units are not specified, the distance is interpreted in pixels {px} by default.

Example

<box spacing = 5>         <! specifies 5 pixels as the value for the spacing property. !>
<box spacing = 5,{px}>    <! 5 pixels; explicitly stated !>
<box spacing = 20,{%}>    <! percentage units !>
<box spacing = 12,{pt}>   <! typesetting point units !>
<box spacing = 1.2,{em}>  <! multiple of current font size !>