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HTML <html> xmlns 属性

❮ HTML <html> 标签

示例

一个简单的 XHTML 文档,包含最少的必需标签

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>文档标题</title>
</head>

<body>
文档内容......
</body>

</html>
自己尝试 »

定义和用法

The xmlns 属性指定文档的 xml 命名空间。

注意:The xmlns 属性在 XHTML 中是必需的,在 HTML 4.01 中是无效的,在 HTML5 中是可选的。

注意:The HTML validator at http://w3.org 不会在 XHTML 文档中缺少 xmlns 属性时报错。这是因为命名空间 "xmlns=http://www.w3.org/1999/xhtml" 是默认的,即使您不包含它,它也会添加到 <html> 标签中。


浏览器支持

属性
xmlns

语法

<html xmlns="http://www.w3.org/1999/xhtml">

属性值

描述
http://www.w3.org/1999/xhtml 要使用的命名空间(对于 XHTML 文档)

❮ HTML <html> 标签
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