/* spec information about this property
name= display
css1= http://www.w3.org/TR/2008/REC-CSS1-20080411/#display
css2= http://www.w3.org/TR/2008/REC-CSS2-20080411/visuren.html#propdef-display
css21= http://www.w3.org/TR/2011/REC-CSS2-20110607/visuren.html#propdef-display
css3= http://www.w3.org/TR/2007/WD-css3-box-20070809/#display
other= http://www.w3.org/TR/2011/WD-css3-layout-20111129/#declaring-templates-the-display-property
other= http://www.w3.org/TR/2012/CR-css3-flexbox-20120918/#flex-containers
other= https://www.w3.org/TR/2014/WD-css-ruby-1-20140805/#ruby-display
*/