​x
 
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<!DOCTYPE html>
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<title>My Example</title>
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​
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<script>
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document.addEventListener("DOMContentLoaded", function(event) {
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​
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  var e = document.getElementById("go");
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  e.addEventListener( "click", function() {
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​
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    var name=prompt("What is your name?","Homer");
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    if ( name!=null && name!="" ) {
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      output = "Well " + name + ". You seem very daring!";
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      }
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    else {
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      output = "Hey, I asked you your name!";
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      }
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    document.getElementById( "msg" ).innerText = output;
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​
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  }, false);
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});
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</script>
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​
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<!-- Replace '{action page}' with your own action page to support non-JavaScript users -->
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<form name="myForm" action="{action page}">
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  <input id="go" type="button" value="I dare you to click me!">
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</form>
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<p id="msg"></p>