<html>
<body>
<a href="/home">BBB</a>
<b id="aaaa">bbb</b>
<a id="blabla" href="/" rel="nofollow">
<b>AAA</b><u id="ble">UUU</u>AAAAAAA
</a>
<a id="bb" href="/">BB</a>
<script>
function aa()
{
window.alert(document.getElementById('blabla').hasAttribute('rel'));
}
function bb()
{
window.alert(document.getElementById('ble').hasAttribute('href'));
}
</script>
<button onclick="return aa()">blabla rel true</button>
<button onclick="return bb()">ble href false</button>
</body>
</html>