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Size: a a a
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<br/>
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In HTML4.01 or earlier, it is <br>. This is case-insensitive, and whitespace between the r and the > is ignored.
In all forms of XHTML it is <br/>. This is case-sensitive, and again whitespace between the r and the /> is ignored. <br></br> is also allowed, but unusual (there are backwards-compatibility issues, it's extra typing, and allows for bugs if you introduce more content between the tags by mistake, but it does sometimes happen in XML-programattically produced code).
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