Example
<!DOCTYPE html>
<html>
<head>
<title>onmouseover and onmouseout</title>
</head>
<body>
<img src="http://placehold.it/350x150" onmouseover="this.src='http://placehold.it/200x200';"
onmouseout="this.src='http://placehold.it/350x150';" />
</body>
</html>
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