December 2013
Intermediate to advanced
752 pages
16h
Chinese
Content preview from MOBILE WEB程式設計--第二版
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行動瀏覽器 CSS
|
393
<body>
<a href="/" id="back">Home Page</a>
</body>
</html>
虛擬類別
虛擬類別
link
、
active
、
focus
，與
visited
可與所有的 HTML 瀏覽器及標準相容。問題
在於，虛擬類別會在何時啟用？有一些情況是眾所周知的：例如
link
用於未訪問的超連
結，而
visited
則在該連結位於已瀏覽的歷史記錄時使用。
我們已在第八章討論過表單元素的驗證虛擬類別，如
required
與
invalid
。
那麼
focus
與
active
虛擬類別呢？它的行為在聚焦式、游標式，與觸控式導覽的瀏覽器
各不相同。有一些瀏覽器，例如 iOS Safari 的所有元素皆支援
active
虛擬類別，其他瀏
覽器只有錨點元素支援它。
WAP CSS 標準不提供知名的
hover
虛擬類別，但這個類別可與大部分的非觸控設備相
容，可產生類似的聚焦行為。在觸控設備上，沒有
mouseover
事件；在使用者點選螢幕
之前（或按下它），它不會偵測手指或觸碰位置。
目前也有一些例外，如 Android 的 Sony Xperia Sola 與使用 Windows 8
Pro 的 Microsoft Surface 平板兩者皆支援暫留狀態。在 Surface 平板的例
子中，當使用者使用觸控筆而不是手指時，會觸發
hover
事件。
有一些觸控設備的行動 UI 實作了兩種點選模式：如果我們在一個元素上點按一次，它
會產生如同暫留的效果，如果再點按一下，它會變成點擊，我們可透過 ...
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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.