what is javascript void 0 used for code example

Example: javascript void(0) href

<!DOCTYPE html>
<html>
   <head>
      <title>Understanding JavaScript void(0)</title>
   </head>
   <body>
      <a href="javascript:void(0);" ondblclick="alert('Click it twice!')">Click me not once, but twice.</a>
   </body>
</html>

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Javascript Example

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