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
基本的なCSSアニメーション、 animation‐direction（ P.342の
「点滅」参照）
課題
アニメーションはページの読み込みと同時に始まるとは限りません。例
えば要素へのホバーやマウスボタンの押下（ :active）などの、ユーザー
による操作への応答としてアニメーションが始まることもあります。この
ような場合、我々はアニメーションの継続時間をコントロールできませ
ん。我々が定義した継続時間が経過する前に、ユーザーがアニメーション
を中断してしまうかもしれないからです。ユーザーがマウスカーソルをホ
バーして凝ったアニメーションを開始しても、完了の前にマウスカーソル
を離してしまう可能性があります。このような場合に、何が起こるか考え
てみましょう。
「アニメーションは一時停止する」あるいは「元の状態へとスムーズに
戻る」と思っていた読者は、驚くかもしれません。デフォルトでは、表示
は元の状態へと急に戻ってしまいます。些細なアニメーションでは、この
ようなふるまいが許されることもあるでしょう。しかしほとんどの場合、
ひどいユーザーエクスペリエンスがもたらされることになります。このふ
るまいを変える方法を紹介します。
アニメーションの
スムーズな中断
46
354
8章：トランジションとアニメーション
トランジションの利用がすすめられる
理由のひとつに、アニメーションが抱
えるこのような問題もあげられます。
トランジションでは開始前の状態へと
急に戻ることはなく、逆方向のトラン
ジションとともにスムーズな変化が発 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.