Definition and Usage
用法

The <br> tag inserts a single line break.
<br>标签可以插入一单独的换行

The <br> tag is an empty tag (means that it has no end tag - the following is wrong: <br></br>).
<br>标签是一个空标签（这意味着它并没有结束标签 - 这样是错误的:<br></br>）

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Differences Between HTML and XHTML
在HTML和XHML中的区别

In HTML the <br> tag has no end tag.
在HTML中<br>不需要结束标签

In XHTML the <br> tag must be properly closed, like this: <br />.
在XHTML中<br>标签必须使用合理的关闭，像这样：<br />

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Tips and Notes
注意点

Note: Use the <br> tag to enter blank lines, not to separate paragraphs.
可以使用<br>标签来加入空行，但别用空段落

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Example
实例

源代码	输出结果
This text contains<br />a line break	This text contains a line break

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Standard Attributes
标准属性

id, class, title, style

For a full description, go to Standard Attributes.
查看完整的描述

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Try-It-Yourself Demos
尝试

Line breaks
How to insert line breaks in an HTML document.
给HTML文档加上换行

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