HTML5是否需要具有引用值的属性之间的空格？ [英] Does HTML5 requires spaces between attributes that are of quoted values?
问题描述
当属性有值时，HTML通常允许在属性之间没有空格，并且这些值被引用。
在HTML-
<！DOCTYPE HTML PUBLIC - / / W3C // DTD HTML 4.01 Transitional // EN
http://www.w3.org/TR/html4/loose.dtd\">
< html>
< head>
< title>没有属性空间< / title>
< meta http-equiv =Content-Typecontent =text / html; charset = iso-8859-1>
< / head>
< body>
< p class =CLASStitle ='TITLE'>< / p>
< / body>
< / html>
查看倒数第三行：
< p class =CLASStitle ='TITLE'>< / p>
^^
现在使用这样的HTML块将doctype改为HTML 5（<！DOCTYPE HTML> ），使得实验符合W3C HTML 5标准检查器给出的错误确切地告诉我：
验证输出：1错误
错误第9行，第22列：属性之间没有空格。
< p class =CLASStitle = 'TITLE' >< / p为H.
$
所以我认为HTML 5倒退兼容浏览器如何处理HTML和浏览器AFAIK处理这个问题。所以我至少有点慌张。我也有问题来解释（有点不必要的）已经完成的HTML 5规范，因为我确实发现了它（W3C，请参阅 http://www.w3.org/TR/html-markup/syntax.html#syntax-attributes ）这并不是说这是（可能也不是必须）是一个错误。
您正在阅读已停用的非规范性参考。如果您查看规范（这是规范性的）中的开始标记的定义，它说：
然后，开始标签可能有许多属性，其语法如下所述。 属性必须由一个或多个空格字符相互分隔。
因此，我认为HTML 5向后兼容浏览器在现实中处理HTML的方式，而且AFAIK处理这一问题的浏览器很好。
与现实世界标记兼容是一个设计目标，但很多东西已经过时，而忽略属性之间的空间几乎不会故意发生。
HTML does normally allow to have no spaces between attributes when attributes have values and those values are quoted.
Example (Reference/Source):
In HTML-documents no White Spaces between Attributes are needed.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>no attribute space</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<p class="CLASS"title='TITLE'></p>
</body>
</html>
See the third-last line:
<p class="CLASS"title='TITLE'></p>
^^
Now using such HTML chunk changing the doctype to HTML 5 (<!DOCTYPE HTML>), makes the experimental W3C HTML 5 conformance checker give an error exactly there telling me:
Validation Output: 1 Error
Error Line 9, Column 22: No space between attributes.
<p class="CLASS"title='TITLE'></p> ^
So I thought that HTML 5 is backwards compatible to how browsers deal with HTML in reality and browsers AFAIK deal with this well. So I'm a bit puzzeled at least. I also have problems to decipher the (somewhat needlessly) compilcated HTML 5 specs to be precise at this point because what I did find (W3C again, see http://www.w3.org/TR/html-markup/syntax.html#syntax-attributes) it's not saying that this is (may nor must) be an error.
You are reading a discontinued, non-normative reference. If you look at the definition of the start tag in the specification (which is normative) it says:
Then, the start tag may have a number of attributes, the syntax for which is described below. Attributes must be separated from each other by one or more space characters.
So I thought that HTML 5 is backwards compatible to how browsers deal with HTML in reality and browsers AFAIK deal with this well.
Being compatible with real world markup is a design goal, but lots of things have been obsoleted and leaving out the space between attributes is something that almost never occurs intentionally.
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