In the same way that srcset builds upon the src attribute, the picture element builds upon the img element. The picture element wraps around an img element. "> </picture>If there is no img element nested inside the picture element, the picture element won't work. Like the srcset attribute, the picture element will update the value of the src attribute in that img element. You probably won't need to use the picture element for most of your responsive images—the srcset and sizes attributes on the img element cover a lot of use cases.