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。
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