MC-36202: Support same site

- add comments

Author: omiroshnichenko

app/code/Magento/PageBuilder/view/adminhtml/web/js/content-type/observable-updater/attributes.js

@@ -41,6 +41,7 @@ export default function generate(
             value = converterPool.get(converter).toDom(attributeConfig.var, data);
         }
 
+        // Replacing src attribute with data-src to prevent img requests in iframe during master format rendering
         if (attributeConfig.name === "src" && Config.getMode() !== "Preview") {
             attributeData["data-" + attributeConfig.name] = value;
         } else {

app/code/Magento/PageBuilder/view/adminhtml/web/js/utils/directives.js

@@ -132,6 +132,12 @@ export function convertMediaDirectivesToUrls(html: string): string {
     return html;
 }
 
+/**
+ * Replace data-src attribute with src.
+ *
+ * @param {string} html
+ * @returns {string}
+ */
 export function replaceSrc(html: string): string {
     return html.replace(
         new RegExp("data-src=\"\{\{", "g"),