/* spec information about this property
name= line-height
css1= http://www.w3.org/TR/2008/REC-CSS1-20080411/#line-height
css2= http://www.w3.org/TR/2008/REC-CSS2-20080411/visudet.html#propdef-line-height
css21= http://www.w3.org/TR/2011/REC-CSS2-20110607/visudet.html#propdef-line-height
css3= http://www.w3.org/TR/2002/WD-css3-linebox-20020515/#line-height
*/