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Increase size of image on mouseover using CSS

<html>
   <head>
     <style> img { width: 140px; } img:hover { width: 400px; } </style>
   </head>
   <body>
     <h1>Increase size of image on mouseover using CSS </h1>
     <img src="http://img.youtube.com/vi/0OR9lFuCXyc/0.jpg" alt="test" />
   </body>
</html>

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