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[メモ]picture要素で使うsourceタグにもwidthとheight属性を書くといいらしいhttps://parashuto.com/rriver/development/picture-source-size-attributes
[メモ]picture要素で使うsourceタグにもwidthとheight属性を書くといいらしいhttps://parashuto.com/rriver/development/picture-source-size-attributes