批改状态:合格
老师批语:效果不错,继续加油
<!DOCTYPE html><html lang="zh-CN"><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>相对定位与绝对定位</title></head><body><ul><li class="one">item1</li><li class="two">item2</li></ul><div class="box">box</div></body></html><style>* {margin: 0;padding: 0;box-sizing: border-box;}body {border: 5px solid red;height: 20em;}ul {border: 5px solid blue;height: 14em;width: 20em;}ul li {border: 1px solid black;list-style: none;}ul li:first-child {background-color: yellow;}ul li:first-child + * {background-color: violet;}ul li.one {position: relative;top: 10px;left: 20px;}ul li.two {position: absolute;height: 200px;width: 200px;left: 0;right: 0;top: 0;bottom: 0;margin: auto auto;}.box {border: 1px solid darkgreen;background-color: greenyellow;height: 150px;width: 150px;position: fixed;right: 10px;bottom: 10px;}</style>

relative:在原始位置上稍偏移位置。
absolute:在附近位置发生元素偏移。
rixed:在HTML块内偏移,不受文档限制
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