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professional-javascript-14-OnErrorExample3.htm / htm

          <title>OnError Example</title>
          <script type="text/javascript">
              window.onerror = function (sMessage, sUrl, sLine) {
                  alert("An error occurred:\n" + sMessage + "\nURL: " + sUrl + "\nLine Number: " + sLine);
                  return true;
      <body onload="nonExistentFunction()">

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