​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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// Wait for DOM to load
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document.addEventListener("DOMContentLoaded", function(event) {
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​
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  // Put the button into a variable
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  var e = document.getElementById("go");
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  // Wait for user to click the button
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  e.addEventListener( "click", function() {
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​
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    // Do the prompt and save user input to a variable
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    var name = prompt("What is your name?","Homer");
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    // Write out the user's input
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    document.getElementById( "msg" ).innerText = name;
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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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<input id="go" type="button" value="Click me">
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<p id="msg"></p>