Untitled

<!DOCTYPE HTML>
<html>
<head>
    <meta charset="utf-8">
    <title>Тег IMG</title>
</head>
<body>
<p id='test_p'></p>
<a id='test_a' href="cat.html">Кошки</a>
<script>
    document.getElementById('test_a').addEventListener("click",function() {
        href = document.getElementById('test_a').getAttribute('href');
        a = document.getElementById('test_a');
        a.innerHTML += '('+href+')';
    })
</script>

</body>
</html>