レスポンシブイメージのネイティブサポート - HTML5 Rocks<picture> <img src="image.jpg" alt="A description of the image."> </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. The difference is that where the srcset attribute gives suggestions to the browser, the picture element gives commands
