编程字典

源代码

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>编程字典</title>

.tooltip .tooltiptext {
        visibility: hidden;
        width: 120px;
        background-color: black;
        color: #fff;
        text-align: center;
        border-radius: 6px;
        padding: 5px 0;
        position: absolute;
        z-index: 1;
        bottom: 150%;
        left: 50%;
        margin-left: -60px;
    }

.tooltip .tooltiptext::after {
        content: "";
        position: absolute;
        top: 100%;
        left: 50%;
        margin-left: -5px;
        border-width: 5px;
        border-style: solid;
        border-color: black transparent transparent transparent;
    }

.tooltip:hover .tooltiptext {
        visibility: visible;
    }
  </style>
</head>

<h2>顶部底部箭头提示</h2>

<div class="tooltip">鼠标经过我
    <span class="tooltiptext">提示文本</span>
  </div>

</body>
</html>

运行结果