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The last example for window.clearTimeout() method has an explanation that appears to be inconsistent with the 'try it yourself' example on the JavaScript Timing Events page. I have put the text needing corrected in red: How to Stop the Execution?The clearInterval() method is used to stop further executions of the function specified in the setInterval() method. Syntaxwindow.clearInterval(intervalVariable) The window.clearInterval() method can be written without the window prefix. To be able to use the clearInterval() method, you must use a global variable when creating the interval method: myVar=setInterval("javascript function",milliseconds); Then you will be able to stop the execution by calling the clearInterval() method. ExampleSame example as above, but we have added a "Stop time" button: <p id="demo"></p><button onclick="myStopFunction()">Stop time</button><script>var myVar=setInterval(function(){myTimer()},1000);function myTimer(){var d=new Date();var t=d.toLocaleTimeString();document.getElementById("demo").innerHTML=t;}function myStopFunction(){clearInterval(myVar);}</script> Try it yourself » If I have been learning my lessons correctly, typing in var makes the variable local. If this is the case, then it would seem the clearInterval() worked without setting a global variable. Does this need updated?