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<!DOCTYPE html> <html> <head> <base id="myBase" href="http://www.w3ii.com/jsref/"> </head> <body> <p>Click the button to return the value of the href attribute of the base element.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myBase").href; document.getElementById("demo").innerHTML = x; } </script> </body> </html>