All browsers from Internet Explorer 5.5 and on ( IE5 .5 \/ 6\/7 , Firefox , Safari \/ KHTML , Opera 8\/9 , etc. ) that support JavaScript will properly collapse the elements . All browsers from Internet Explorer 5.5 and on ( IE6\/7\/8 , Firefox , Safari\/Chrome\/KHTML , Opera 8\/9 , etc. ) that support JavaScript will properly collapse the elements .