Issue #3285476 by vlad.dancer, smustgrave, seanB: ResizeObserver#observe()...

Issue #3285476 by vlad.dancer, smustgrave, seanB: ResizeObserver#observe() firing the callback immediately results in infinite loop for Chromium based browsers

js/resizer.js

@@ -21,6 +21,7 @@
             const availableWidth = Math.floor(image.parentNode.clientWidth);
             const attrWidth = image.getAttribute('width');
             const sources = image.getAttribute('data-srcset').split(',');
+            const currentSrc = image.getAttribute('src');
 
             // If the selected image is already bigger than the available width,
             // we do not update the image.
@@ -39,6 +40,10 @@
               }
             }
 
+            if (responsiveImgPath === currentSrc) {
+              return;
+            }
+
             // Update the "src" with the new image and also set the "width"
             // attribute to easily check if we need a new image after resize.
             image.setAttribute('src', responsiveImgPath);