54 lines
1.3 KiB
HTML
54 lines
1.3 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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<style>
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* {
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margin: 0;
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padding: 0;
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}
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div {
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width: 60px;
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height: 60px;
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}
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.box1 {
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width: 200px;
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height: 200px;
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background: yellow;
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margin: 20px;
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/* position:static */
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position: relative;
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}
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.box2 {
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background: red;
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position: absolute;
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top: 10px;
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left: 20px;
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}
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</style>
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</head>
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<body>
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<div class="box1">
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<div class="box2"></div>
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</div>
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<p>
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<p> 注：两个div都是绝对定位时，这里红色的div是依据 body定位的，而不是根据父元素黄色的div 定位，</p>
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<p> 加上position static 后也是根据body 定位，</p>
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<p>当父元素的Position声明为 absolute 时，红色会依据父级黄色定位，但是会超脱文档流，影响下面的元素</p>
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</p>
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<p>
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总结2： 父元素是相对定位 子元素是绝对定位时，不会扰乱整体的布局而且可以使子元素依据父元素边缘定位
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</p>
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</body>
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</html>
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