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var beforeload = (new Date()).getTime(); // calculate the time before calling the function in window.onload

function getPageLoadTime() {
	var afterload = (new Date()).getTime(); // calculate the current time in afterload
	seconds = (afterload - beforeload) / 1000; // now use the beforeload and afterload to calculate the seconds
	console.log('Page load time :  ' + seconds + ' sec(s).'); // Place the seconds in the innerHTML to show the results
}

window.onload = getPageLoadTime;