5. Defer loading of JavaScript If you must use JavaScript, then it is a good idea to defer the loading of this code until after the page load event has fired. Google actually provides a deferral script you can use to do this: codesource // Add a script element as a child of the body function downloadJSAtOnload() { var element = document.createEl…

defer java on loading

// Check for browser support of event handling capability
if (window.addEventListener)
    window.addEventListener("load", downloadJSAtOnload, false);
else if (window.attachEvent)
    window.attachEvent("onload", downloadJSAtOnload);
else window.onload = downloadJSAtOnload;