@micropackage/responsive-embeds/src/polyfill.js

Makes any embed responsive, no markup changes required.

if ( window.NodeList && ! NodeList.prototype.forEach ) {
	NodeList.prototype.forEach = function( callback, thisArg ) {
		thisArg = thisArg || window;
		for ( let i = 0; i < this.length; i++ ) {
			callback.call( thisArg, this[ i ], i, this );
		}
	};
}