可以使用< hr />元素有一个结束标记？ [英] Can a <hr /> element have a closing tag?
问题描述
我的同事并不真正了解或理解html。她的工作是向CMS输入信息，我注意到她一直关闭她的< hr /> 标签，例如< hr> < / h> 。
我有一个Google，但是我找不到任何说不允许或不可以的地方造成问题。我知道它应该是< hr /> ，但值得告诉她吗？或者它是不必要的但是有效的标记？
NB我们网站的doctype是
XHTML 1.0 Transitional ，如果这有什么区别的话。
编辑
@Jeff对验证有个好主意。我使用了以下代码，显然这是有效的XHTML 1.0 Transitional
<！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>< / title>
< / head>
< body>
< hr>< / hr>
< / body>
< / html>
OK，< hr> ;< / hr> 实际上也是一个有效的XHTML 1.0。
-
< hr />有效 -
< hr>< / hr>有效 -
< hr>有效
...对于HTML 4.0：
< hr /> 有效
< ; hr>< / hr> 是不是有效
< hr> 有效
因此最好的选择是使用< hr /> ，它总是有效的。
My colleague doesn't really know or understand html. Her job is to input information into the CMS and I've noticed she keeps closing her <hr /> tags like this <hr></hr>.
I've had a Google but I can't find anywhere that says this isn't allowed or could cause problems. I know it's supposed to be <hr /> but is it worth me telling her or is it unnecessary but valid markup?
NB The doctype for our website is
XHTML 1.0 Transitional if that makes any difference.
EDIT
@Jeff had a good idea about validating. I used the following code and apparently this is valid XHTML 1.0 Transitional
<!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></title>
</head>
<body>
<hr></hr>
</body>
</html>
OK, <hr></hr> is actually a valid XHTML 1.0, too.
So, for XHTML 1.0:
<hr />is valid<hr></hr>is valid<hr>is not valid
... for HTML 4.0:
<hr />is valid<hr></hr>is not valid<hr>is valid
therefore the best option is to use <hr />, which is always valid.
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