Example Iframe

<iframe width="560" height="315" src="" data-src="//www.youtube.com/embed/OMOVFvcNfvE" frameborder="0" allowfullscreen></iframe>

You want to change the existing src="" to data-src="" and add a new empty src="" tag


function init() {
var vidDefer = document.getElementsByTagName('iframe');
for (var i=0; i<vidDefer.length; i++) {
if(vidDefer[i].getAttribute('data-src')) {
} } }
window.onload = init;

information originally found at : https://varvy.com/pagespeed/defer-videos.html

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