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
RGBAを使った色指定
課題
ある特定の UI 要素に注目してもらうために、その背後にあるすべての
要素に半透明の黒色を重ねたい場合があります（図6.13）。画像表示のた
めのLightboxや、ユーザーインタフェースを紹介する「クイックツアー」
などでもこの効果が効果を発揮しています。背景を暗くするために、
HTMLの要素を追加して下のような CSSを適用する方法がしばしば行われ
ています。
背景を暗くして重要度を
下げる
32
.overlay{/*背景を暗くするための要素*/
position:fixed;
top:0;
right:0;
bottom:0;
left:0;
background:rgba(0,0,0,.8);
}
264
6章：ユーザーエクスペリエンス
.overlayの要素は、 .lightboxよりも背後にあるすべての要素を暗
くするために使われます。 .lightboxの z‐indexには他より大きい値が
指定されており、手前側に表示されます。この仕組みは問題なく機能はす
るのですが、HTMLの要素が余分に必要になるというデメリットがありま
す。つまり、CSSだけでは目的を達成できません。大したことではないと ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.