wer ▁has ▁sc rolled ▁the ▁ad ▁space ▁in ▁or ▁out ▁of ▁the ▁visible ▁area ▁of ▁the ▁browser ▁window , ▁minim ized , ▁tab bed ▁away , ▁or ▁opened ▁another ▁browser ▁or ▁application ▁window ▁bringing ▁the ▁web ▁page ▁monitor ed ▁out ▁of ▁focus ▁or ▁portion ▁of ▁the ▁browser ▁window ▁with ▁the ▁ad ▁space ▁outside ▁of ▁the ▁monitor ▁screen . ▁When ▁ 6 0 %, ▁( or ▁other ▁pre - defined ▁area ) ▁of ▁the ▁ad ▁content ▁on ▁a ▁web ▁page ▁is ▁within ▁the ▁visible ▁area ▁of ▁the ▁vie wer ' s ▁browser ▁window ▁for ▁one ▁second , ▁a ▁message ▁is ▁sent ▁via ▁Cor rel ator ▁and ▁a ▁" View able ▁Im pression " ▁is ▁reported . ▁The ▁Cor rel ator ▁code ▁continues ▁to ▁monitor ▁the ▁web ▁page ▁focus ▁and ▁scrolling ▁position , ▁location ▁of ▁ad ▁unit ( s ) ▁and ▁the ▁visible ▁area ▁of ▁the ▁browser ▁window , ▁and ▁communic ates ▁to ▁the ▁reporting ▁server ▁logging ▁the ▁“ Time ▁in ▁View ” ▁for ▁the ▁ad s ▁being ▁delivered ▁on ▁the ▁webpage . ▁ ▁Im plementation ▁ ▁The ▁complete ▁vie wer ' s ▁environment ▁is ▁gathered ▁by ▁a ▁client - side ▁technology ▁for ▁every ▁view able ▁impression ▁reported ▁and ▁transm itted ▁back ▁to ▁a ▁server - side ▁database . ▁Data ▁for ▁each ▁view ▁includes ▁the ▁view ers ▁display ▁resolution , ▁the ▁vie wer ' s ▁browser ▁window ▁dimensions , ▁the ▁dimensions ▁of ▁the ▁web ▁page ▁the ▁ad ▁appeared ▁on , ▁the ▁location ▁of ▁the ▁ad ▁on ▁the ▁page , ▁and ▁the ▁scroll ▁position ▁at ▁the