<img src="sample.jpg" srcset="sample@2x.jpg 2x, sample@3x.jpg 3x" alt="画像"> srcset属性を使うとRetinaディスプレイ/高解像度ディスプレイに対応した画像を置くことができる。 参考 レスポンシブ画像 - MDN レスポンシブ画像2: sizes属性 <img srcset="sample-320w.jpg 320w, sample-480w.jpg 480w, sample-800w.jpg 800w" sizes="(max-width: 320px) 280px, (max-width: 480px) 440px, 800px" src="sample-800w.jpg" alt="画像">
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