css原生输入框验证，valid和invalid
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css 定义横屏样式或竖屏样式
12345678/* 竖屏 */@media screen and (orientation: portrait) { // some css code}/* 横屏 */@media screen and (orientation: landscape) { // some css code}
html技术： 用svg标签画图
如同canvas一样，svg标签是个画布(容器)，用来放图 1234<!-- 必须初始化宽高，要不然看不见了 --><svg width="600px" height="400px"> <!-- 放画的图 --></svg> 输出直线：<line /> 效果： 输出折线：<poly
css 钟表
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原生CSS滚动效果
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css选择前几个元素或者后几个元素
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js操作css变量（属性）
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