[ gpt ] callback event


is fired when an impression becomes viewable, according to the Active View criteria.


is fired when the creative’s iframe fires its *load* event.

When rendering *rich media ads* in sync rendering mode, no iframe is used so *no* SlotOnLoadEvent will be fired.


is fired when a *slot* on the page has *finished rendering*

Example: To listen to companion ads, add a listener to the companionAds service, not the pubads service.


googletag.cmd.push(function() {
googletag.pubads().addEventListener('impressionViewable', function(event) {


googletag.pubads().addEventListener('slotOnload', function(e) {


googletag.pubads().addEventListener('slotRenderEnded', function(e) {



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