elegant degradation
fail-safe
fail-soft
https://source.unsplash.com/featured/?elegant-degradation#.png
/suto3/google.iconelegant degradation
/suto3/Google画像検索.iconelegant degradation
/suto3/Google定義検索.icon elegant degradation
/suto3/wikipedia.iconelegant degradation
/suto3/weblio.icon elegant degradation
/suto3/kotobank.icon elegant degradation
/suto3/jisho.icon elegant degradation