July 2016
Intermediate to advanced
384 pages
10h 11m
Japanese
Content preview from CSSシークレット ―47のテクニックでCSSを自在に操る
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知っておくべきポイント
CSSトランスフォーム、CSSグラデーション、 P.130の「角の切り落
とし」
課題
1 つの角（一般的には右上または右下）が折り返されたような表示のス
タイルは、装飾としてとても広く使われています。折り返しの角度はさま
ざまです。
CSSだけを使ってこのような表示を行う方法がいくつか考案されていま
す。初めて発表されたのは 2010 年のことで、擬似要素を極めた Nicolas
Gallagher （ nicolasgallagher.com/pure‐css‐folded‐corner‐
effect）によるものでした。多くの方法では、 2 つの三角形が使われま
す。1 つは折り返された形状のために、もう 1 つはメインの要素の角を隠
すためにそれぞれ使われます。そして、これらの三角形は古くからある
ボーダー関連のテクニックを使って生成されるのが一般的です。
角の折り返し
19
188
4章：視覚効果
当時はとても印象的に思えましたが、制約も多く、以下のような場合に
は対応できません。
これらの場合にも対応した、柔軟な表示効果を実現できないかどうか考
えてみましょう。
45度の場合の解決策
まずは P.130の「角の切り落とし」で紹介したグラデーションベースの
テクニックを使い、右上 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.