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<title>abbr was earlier acronym tag</title>
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It is used to mark abbreviation or acronym of the words.
<p>
<abbr title="DotNetFunda.com">DNF</abbr>
<span title="DotNetFunda.com">DNF</span>
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Something is <span style="color:red;">good</span>.
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The <abbr> tag is used to mark abbreviation