javascript - Strange setInterval behavior while tab is switched -


i have banner this:

http://jsfiddle.net/ek658cmz/1/

it's using several intervals make animation (i can't use jquery or that, in project), , perfect, before switch tab. if switch tab , return after seconds animation isn't working properly, looks several animations trying ran @ same time. interesting, if switchback instantly banner tab, okay, more time "out" - more glitches get.

i've tried clearinterval on window blur 

window.addeventlistener('blur', function () {     banner.stopanimation(); }, false);

like that, tried play animation initiations 

window.addeventlistener('load', function () {     banner.init(); }, false);  window.addeventlistener('focus', function () {     banner.init(); }, false);

there several atempts reload page on blur location.reload(), no success.

what noticed, when blur window opening window somewhere, animation ended normally, , wont start, when switch time, animation ticking in background each second

enter image description here

there 1 nuance here also, banner must ran in iframe.


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