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[GENS]

わかりやすい

[riocampos2]

nは0と自然数で単調増加の扱い。なので-nは0と負の整数で単調減少。-n+5だと5-nなわけか。 :nth-childの使い方 | CSSPRO

[riocampos]

nは0と自然数で単調増加の扱い。なので-nは0と負の整数で単調減少。-n+5だと5-nなわけか（jQueryでは-n+5じゃないと効かない）。

[shinki0121]

css3 セレクタ

[naka-06_18]

nth-child