How to find page rendering time(not page loading time) using javascript -


i use below syntax find page loading time not sure how identify page rendering time using javascript. 

var loadtime = window.performance.timing.domcontentloadedeventend- window.performance.timing.navigationstart; 

var rendertime = window.performance.timing.domcomplete-window.performance.tim‌​ing.domcontentloaded‌​eventend

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