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issue での要件は、ポップアップ内にひとつだけ画像を表示できるプロパティを追加することでしたが、img タグをsanitize しないタグに追加してもOKと判断し、そちらの方向で実装しました。
サニタイズをおこなう sanitize-html は、img タグの "src", "srcset", "alt", "title", "width", "height", "loading" といった attributes 以外は受け付けないというように、img タグを sanitize しないタグに追加することを想定している。
Ref. https://www.npmjs.com/package/sanitize-html
Closes #318