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Empty HTML Elements
HTML elements with no content are called empty elements. Empty elements can be closed in the start tag.
<br> is an empty element without a closing tag (the <br> tag defines a line break).
In XHTML, XML, and future versions of HTML, all elements must be closed.
Adding a slash to the start tag, like <br />, is the proper way of closing empty elements, accepted by HTML, XHTML and XML.
Even if <br> works in all browsers, writing <br /> instead is more future proof.
