/* spec information about this property
name= margin-top
css1= http://www.w3.org/TR/2008/REC-CSS1-20080411/#margin-top
css2= http://www.w3.org/TR/2008/REC-CSS2-20080411/box.html#propdef-margin-top
css21= http://www.w3.org/TR/2011/REC-CSS2-20110607/box.html#propdef-margin-top
css3= http://www.w3.org/TR/2007/WD-css3-box-20070809/#margin-top
other= 
*/