exclude images with srcset defined

lib/single-file/doc-helper.js

@@ -158,7 +158,7 @@ this.docHelper = this.docHelper || (() => {
 	function getImageData(doc, options) {
 		if (doc) {
 			const data = [];
-			doc.querySelectorAll("img[src]").forEach((imageElement, imageElementIndex) => {
+			doc.querySelectorAll("img[src]:not([srcset])").forEach((imageElement, imageElementIndex) => {
 				imageElement.setAttribute(imagesAttributeName(options.sessionId), imageElementIndex);
 				let imageData;
 				if (imageElement.src) {