.leaf:before{
	content:'○';
	padding:0 3px 0 3px;
}
.seta:hover{
	outline:dotted thin black;
}
.seta:before{
	content:'▷';
	cursor:pointer;
	padding:0 3px 0 3px;
}
.aberto > * > .seta:before{
	content:'▽';
}
.filhos{
	display:none;
	padding-left:20px;
}
.aberto > .filhos{
	display:-moz-box;
}