不成对的 HTML tag

  • <br>
    If you are outputting HTML on a regular website you can use <br> or <br/> , both are valid anytime you are serving HTML5 as text/html. If you are serving HTML5 as XHTML (i.e. content type application/xhtml+xml, with an XML declaration) then you must use a self closing tag like so: <br/>
  • <hr>
    In HTML5, the <hr> tag defines a thematic break.
    In HTML 4.01, the <hr> tag represents a horizontal rule.
    However, the <hr> tag may still be displayed as a horizontal rule in visual browsers.
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