<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <style>
    #div1 {
      width: 1000px;
      height: 500px;
      border: 1px black solid;
    }
    #div2 {
      width: 100px;
      height: 100px;
      background-color: aqua;
    }
    #div3 {
      width: 100px;
      height: 100px;
      background-color: rebeccapurple;
      position: relative;
      top: 10px;
      left: 10px;
    }
  </style>
  <body>
    <div id="div1">
      <div id="div2">我是div</div>
      <div id="div3">我是相对定位</div>
    </div>
  </body>

相对定位_html

 

 相对定位

设置为相对定位的元素框会偏移某个距离。元素仍然保持其未定位前的形状，它原本所占的空间仍保留