<div class="a"></div>
<div class="b"></div>
abcss
<div class="a"></div>
<div class="b"></div>
abcss the answer given by the brother upstairs can solve the example in your problem perfectly.
+ only applies to parallel elements immediately following. If there is more element c between an and b, then using .a: hover+.b is invalid.
it is recommended to use ~ , which can select all subsequent peer elements of this element
.a: hover+.b
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