function resizeIFrameToFitContent( iFrame ) {
iFrame.width = iFrame.contentWindow.document.body.scrollWidth; iFrame.height = iFrame.contentWindow.document.body.scrollHeight; }
window.addEventListener('DOMContentLoaded', function(e) {
var iFrame = document.getElementById( 'buycoinsFrame' ); resizeIFrameToFitContent( iFrame );
// or, to resize all iframes: var iframes = document.querySelectorAll("iframe"); for( var i = 0; i < iframes.length; i++) { resizeIFrameToFitContent( iframes[i] ); } } );