使用以下 html，当我将鼠标悬停在子项上时，我会在父项上获得绿色背景.我怎样才能阻止这种情况发生?如果我悬停在子元素之外，我确实想要绿色背景.

With the following html, when I hover over child, I get a green background on parent. How can I stop that from happening? I do want the green background if I am hovering outside of the child element.

CSS3 很好.

.parent {
  padding: 100px;
  width: 400px;
  height: 400px;
}

.parent:hover {
  background-color: green;
}

.child {
  padding: 100px;
  width: 200px;
  height: 200px;
}

.child:hover {
  background-color: blue;
}

<div class="parent">
  <div class="child">Child</div>
</div>

推荐答案

所以这真的很难看，但它确实有效(有点).我基本上是在创建父母的副本作为孩子的兄弟姐妹.parent-overwrite 默认隐藏，然后在 child 悬停时显示.Chrome 不喜欢它，除非您使用 + 选择器而不是 ~ 选择器.这不是很可扩展，但它可能会起作用.

So this is REALLY ugly, but it works (kind of). I'm basically creating a duplicate of parent as a sibling of child. parent-overwrite is hidden by default, then displayed on the hover of child. Chrome doesn't like it unless you use the + selector instead of the ~ selector. This isn't very scalable, but it may work.

正如其他人所说，javascript 可能是更好的解决方案.

As the other guys posted, javascript would likely be a better solution.

 <style>
  .parent { padding: 100px; width: 400px; height:400px; position: relative; z-index: 998; }
  .parent:hover { background-color: green; }
  .child { padding: 100px; width: 200px; height:200px; position: relative; z-index: 1000; }
  .child:hover { background-color: blue; }
  .parent-overwrite { padding: inherit; width: inherit; height: inherit; position: absolute; top: 0; left: 0; z-index: 999; background-color: #FFF; display: none; }
  .child:hover ~ .parent-overwrite { display: block; }
</style>

<div class="parent">
    <div class="child">Child</div>
    <div class="parent-overwrite"></div>
</div>