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浮动是不是css3新增的

WBOY

WBOY

发布时间:2022-04-11 17:49:10

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来源于php中文网

原创

浮动不是css3新增的。利用float属性可以定义元素在哪个方向浮动,该属性在css1时就已经可以使用了;无论设置浮动的元素本身是什么元素,设置浮动后,元素会生成一个块级框,语法为“元素{float:value;}”。

浮动是不是css3新增的

本教程操作环境:windows10系统、CSS3&&HTML5版、Dell G3电脑。

浮动是不是css3新增的

float 属性定义元素在哪个方向浮动。以往这个属性总应用于图像,使文本围绕在图像周围,不过在 CSS 中,任何元素都可以浮动。浮动元素会生成一个块级框,而不论它本身是何种元素。

如果浮动非替换元素,则要指定一个明确的宽度;否则,它们会尽可能地窄。

注释:假如在一行之上只有极少的空间可供浮动元素,那么这个元素会跳至下一行,这个过程会持续到某一行拥有足够的空间为止。

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元素的水平方向浮动,意味着元素只能左右移动而不能上下移动。

一个浮动元素会尽量向左或向右移动,直到它的外边缘碰到包含框或另一个浮动框的边框为止。

浮动元素之后的元素将围绕它。

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浮动元素之前的元素将不会受到影响。

如果图像是右浮动,下面的文本流将环绕在它左边:

示例如下:




 
123/title>
<style>
img 
{
float:right;
}
</style>
</head>
<body>
<p>在下面的段落中,我们添加了一个 <b>float:right</b> 的图片。导致图片将会浮动在段落的右边。</p>
<p>
@@##@@
这是一些文本。这是一些文本。这是一些文本。
这是一些文本。这是一些文本。这是一些文本。
这是一些文本。这是一些文本。这是一些文本。
这是一些文本。这是一些文本。这是一些文本。
这是一些文本。这是一些文本。这是一些文本。
这是一些文本。这是一些文本。这是一些文本。
这是一些文本。这是一些文本。这是一些文本。
这是一些文本。这是一些文本。这是一些文本。
这是一些文本。这是一些文本。这是一些文本。
这是一些文本。这是一些文本。这是一些文本。
</p>
</body>
</html></pre><p>输出结果:</p>
<p><img  alt="浮动是不是css3新增的" ></p>
<p>(学习视频分享:<a href="https://www.php.cn/course/list/12.html" target="_blank">css视频教程</a>)</p>
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