aswjh opened a new issue #13081:
URL: https://github.com/apache/incubator-echarts/issues/13081
### What problem does this feature solve?
当鼠标悬停在某link上时，高量显示该类link及其连接的node
### What does the proposed API look like?
<path id="node1" class="a"></path>
<path id="node2" class="a"></path>
<path id="node3" class="b"></path>
<path id="link1" class="a"></path>
<path id="link2" class="b"></path>
.a:hover {xxx}
.b:hover {xxx}
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