XHTML 标签在 HTML 中有效吗？
据我所知，HTML 中的换行符是
我知道您不能在 XHTML 文档中使用上述 HTML 标记，但反之亦然呢？
I understand a line break in HTML is <br> and the XHTML equivalent is <br />.
I know that you cannot use the above HTML tag in a XHTML document, but what about vice versa? Is <br /> valid in HTML?
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这取决于您所讨论的 HTML 版本。
在最新的稳定版本HTML 4.01中，语法含义相同为
>
>
>（尽管通常无效），但是并不意味着你想要什么。浏览器的限制（由 XHTML 1.0 规范利用）意味着它会被视为
HTML 5 改变了这一点 并将
/ 转换成语法糖。完全没有意义，但允许，所以 XML 迷们很高兴。It depends which version of HTML you are talking about.
In the latest stable version, HTML 4.01, the syntax means the same as
<br>>which means the same as<br>>. This means it is valid, since you can have a>anywhere you can have a line break, (although<meta />usually isn't valid) but doesn't mean what you want. Limitations in browsers (exploited by the XHTML 1.0 spec) mean that it gets treated as<br>even though it shouldn't be. The mess around this feature means it is marked as to be avoided.HTML 5 changes that and turns the
/into syntactic sugar. Utterly meaningless but allowed so the XML junkies are kept happy.
另请注意，除非您使用 MIME 类型
application/xhtml+xml提供文档，否则将
编辑：哦，是的，在 HTML5 中，结束
/再次正式可选。<br />is backwards compatible and will not cause rendering problems if used in an HTML document.Also, note that unless you are serving your documents with the MIME type
application/xhtml+xml, putting a<br>in an XHTML document won't cause it to choke. It is a validation error to leave a BR unclosed in an XHTML document, but a very minor one which is unlikely to cause any problems by itself.EDIT: Oh yes, and in HTML5 the closing
/is once again officially optional.
<br />is valid HTML. Some HTML pages may be generated by an XML engine that can't outpout<br>, and as such it must be able to parse it.是的，XHTML 与 HTML 兼容。
我相信 HTML5 中有一个例外，即像
这样的处理指令已被弃用。Yes XHTML is compatible with HTML.
I believe there is one exception in HTML5 which is processing instructions like
<?xml...>have been deprecated.