/* 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= https://www.w3.org/TR/2020/WD-css-inline-3-20200827/#propdef-line-height
*/