批改状态:合格
老师批语:完成的不错,继续加油
id class tagid#权重最高 1.0.0
class.是主流 0.1.0
tag标签用来增加权重 0.0.1
<h2 class="title" id="header">hello</h2>
tag标签
h2 {color:red;}
h2 {color:red;}
tag标签 权重高低决定顺序
body h2 {color:red;}
class 权重高低决定顺序
.title {color:red;}
id1.0.0 权重高低决定顺序
#header {color:red;}
widthheightpaddingloordermargin
可设置width style color
可设置width
大多数内置元素都有默认的padding margin
<body><div class="box">hello</div><style>body {outline: 1px solid black;}.box {width: 200px;height: 100px;border: 1px solid black;padding:5px;background-color: blueviolet;background-clip: content-box;}</style></body>
212*112 源码大小200*100标准计算:200px+10px+2px=212 *100px+10px+2px=112px
<div style="font-size: 1.25em;"><div style="font-size: 2em">hello</div></div>
<body><div style="font-size: 1.25rem;"><div style="font-size: 2rem">hello</div></div></body></html><style>html {font-size: 1rem;}</style>
<body><header>header</header><main>main</main><footer>footer</footer></body><style>* {margin: 0;padding: 0;box-sizing: border-box;}body > * {outline:1px solid;background-color:antiquewhite}header,footer {width: 100vw;height: 5vh;background-color:yellow;}main {width: 100vw;min-height:100vh;margin: 0.5vh 0;min-height: calc(100vh - 11vh);}</style>
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