The page isn't loading the pictures because of the incompatibility of srcset/picture. Is there a fallback built in the extension or rather how is it possible to say TYPO3 to render a fallback image?
If you want to achieve compatibility with IE11, you should include the picturefill.js polyfill into your site. This JavaScript library implements the missing responsive images functionality in older browsers.
There's an issue while rendering the images only with srcset/picture attribute in IE11. https://caniuse.com/#feat=srcset https://caniuse.com/#feat=picture
The page isn't loading the pictures because of the incompatibility of srcset/picture. Is there a fallback built in the extension or rather how is it possible to say TYPO3 to render a fallback image?