哪种是更规范的写法
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泻药 查看更多关于w3c是怎样规定<meta>标签的到底有没有结束的斜杠?的详细内容...
去查规范
HTML 4
The global structure of an HTML document
Start tag: required , End tag: forbidden
HTML5
4.2 Document metadata
Tag omission in text/html: No end tag.
所以：
第一种写法更贴近规范
这里有一个来自 StackOverflow 的回答，它比较详细地解释了你这个问题：
html - Are self-closing tags valid in HTML5? In HTML 5 , means , the start tag . It is not a "self-closing tag" . Instead, certain elements are designated as having no end tag , for example
. These are collectively called void elements . The slash is just syntactic sugar for people who are addicted to XML. Using the slash in a non-void element tag is invalid, but browsers parse it as the start tag anyway, leading to a mismatch in end tags.
自闭合标签使用html5的doctype时不用写反斜杠。