​x
 
<!DOCTYPE html>
<html>
<head>
<style>
.dropdown {
  position: relative;
  display: inline-block;
}
​
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  padding: 12px 16px;
  z-index: 1;
}
​
.dropdown:hover .dropdown-content {
  display: block;
}
</style>
</head>
<body>
​
<h1>可悬停的下拉菜单</h1>
​
<p>请把鼠标移到文本上，已查看下拉内容。</p>
​
<div class="dropdown">
  <span>把鼠标移到我上面</span>
  <div class="dropdown-content">
  <p>Hello World!</p>
  </div>
</div>
​
</body>
</html>
​