#chart {
  width: 960px;
  height: 500px;
  background: #ddd;
}
text {
  pointer-events: none;
}
.grandparent text {
  font-weight: bold;
}
rect {
  fill: none;
  stroke: #fff;
}
rect.parent,
.grandparent rect {
  stroke-width: 2px;
}
.grandparent rect {
  fill: orange;
}
.grandparent:hover rect {
  fill: #ee9700;
}
.children rect.parent,
.grandparent rect {
  cursor: pointer;
}
.children rect.parent {
  fill: #bbb;
  fill-opacity: 0.5;
}
.children:hover rect.child {
  fill: #bbb;
}
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