HTML：BR 的正确形式是什么？
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HTML: What's the correct form of BR?
提问by Adam
How is correct to write the brtag in html?
如何正确写入br标签html？
<br />
or
或者
<br>
or anything else? :))
还是别的什么？:))
回答by casablanca
It depends on the doctype you're using. In the original versions of HTML (up to HTML4), only <br>is correct. In XHTML (which is based on XML), only <br />is correct. In HTML5, both are allowed although <br>is preferred.
这取决于您使用的文档类型。在 HTML 的原始版本（最高为 HTML4）中，只有<br>是正确的。在 XHTML（基于 XML）中，只有<br />是正确的。在 HTML5 中，虽然<br>是首选，但两者都是允许的。
回答by pyvi
It does not need an end tag, so
它不需要结束标签，所以
<br>
is correct for HTML, and
对 HTML 是正确的，并且
<br />
for XHTML.
对于 XHTML。
回答by Jon Hanna
In HTML4.01 or earlier, it is <br>. This is case-insensitive, and whitespace between the rand the >is ignored.
在 HTML4.01 或更早版本中，它是<br>. 这是不区分大小写，并且空格之间r和>被忽略。
In all forms of XHTML it is <br/>. This is case-sensitive, and again whitespace between the rand the />is ignored. <br></br>is also allowed, but unusual (there are backwards-compatibility issues, it's extra typing, and allows for bugs if you introduce more content between the tags by mistake, but it does sometimes happen in XML-programattically produced code).
在所有形式的 XHTML 中，它都是<br/>. 这是区分大小写的，并且再次忽略r和之间的空格/>。<br></br>也是允许的，但不寻常（有向后兼容性问题，它是额外的输入，如果您错误地在标签之间引入更多内容，则允许出现错误，但它有时会发生在以 XML 编程方式生成的代码中）。
Since some earlier browsers that would parse XHTML as earlier HTML would choke on <br/>but not on <br />such extra whitespace is the norm, for backwards compatibility (more backwards kludging it, but still...).
由于一些早期的浏览器将 XHTML 解析为早期的 HTML 会阻塞<br/>但不会阻塞在<br />这种额外的空白处是常态，为了向后兼容（向后兼容它，但仍然......）。
In HTML5 either are allowed (but not <br></br>).
在 HTML5 中，两者都允许（但不允许<br></br>）。
回答by stealthyninja
@CIRK: HTML4, <br>. XHTML 1.x, <br />. <br/>is also acceptable.
@CIRK：HTML4， <br>。XHTML 1.x, <br />. <br/>也是可以接受的。
回答by Marcos Roriz Junior
You should use <br />because it respect the standards XHTML, HTML and in general (XML). Because every xml tag needs to close.
您应该使用<br />它，因为它遵守 XHTML、HTML 和一般 (XML) 标准。因为每个 xml 标签都需要关闭。
回答by ryryan
In HTML (up to version 4) it's <br>And in XHTML it's <br />because the tag has to be properly closed with an /
在 HTML（直到第 4 版）中是，<br>而在 XHTML 中，这是<br />因为标签必须用 / 正确关闭
HTML5 <br>is the best option.
HTML5<br>是最好的选择。
回答by demas
<br/>.
Some of the most common errors in the usage of XHTML are:
Not closing empty elements (elements without closing tags in HTML4)
Incorrect: <br>
Correct: <br />
Note that any of these is acceptable in XHTML: <br></br>, <br/>, and <br />. Older HTML-only browsers interpreting it as HTML will generally accept <br> and <br />.
回答by Randy
it is most formal to use <br/>this is then XHTML compliant - all opening tags have corresponding end tag.
最正式的使用方式<br/>是 XHTML 兼容 - 所有开始标签都有相应的结束标签。
