img の srcset 指定時に選択される画像
Read OriginalHTMLのimgタグやpictureタグでsrcset属性を使用した際に、ブラウザがどのように適切な画像を選択するのかを詳細に検証しています。Viewport WidthとDPR（Device Pixel Ratio）の関係、各ブラウザ（Firefox、Safari、Chrome/Edge）での挙動の違い、そしてHTML仕様が画像選択を「User Agentの実装に委ねている」理由について解説します。
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