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opacity は透明度じゃない

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CSS のプロパティー opacity を「透明度」と書いてあるものをよく見ますが(最近は減ったけど),正しくは「不透明度」ですね。

「透明にするには opacity(プロパティー)を使う」という意図が「opacity は透明度」という誤った連想を生んじゃうのかな。それで,解説記事はなぜかサンプルが

opacity: 0.5

だったりするので,0 が完全透過,1 が完全不透明ということに気づきにくいわけです。

関連する英単語として,opaque [oupéik] があり,形容詞では「不透明な」,名詞では「不透明液」などの意味を持ちます。日本語では「オペーク」。

scivola
主に Ruby 使ってます。 二十年来のコンパイラー恐怖症が Rust で治癒するか?
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