<html> <body> <a href="/home">BBB</a> <b id="aaaa">bbb</b> <a id="blabla" href="/">AAA</a> <a id="bb" href="/">BB</a> <script> function aa() { window.alert(document.getElementById('blabla').id); } </script> <button onclick="return aa()">Click me!</button> </body> </html>