It will look like :-
concatenate '<span style="background-color:#FFFF00;font-weight:bold">' LV_DATA
'</span>' into html_str.
create object html_bee.
html_bee->add( html = html_str ).
For more info Check below threads:
http://scn.sap.com/thread/3164090
http://scn.sap.com/thread/2128064
Thanks
Kumar Gaurav.