such as the infamous discrepancy in box model implementations. These problems threatened to
derail CSS altogether, but fortunately some clever proposals were implemented, and browsers
began to harmonize. Within a few years, thanks to increasing interoperability and high-profile
developments such as the CSS-based redesign of Wired magazine and the CSS Zen Garden, CSS
began to catch on.
Before all that happened, though, the CSS Working Group had finalized the CSS2 specification
in early 1998. Once CSS2 was finished, work immediately began on CSS3, as well as a clarified
version of CSS2 called CSS2.1. In keeping with the spirit of the times, what was initially coined
CSS3 was constructed as a series of (theoretically) standalone modules instead of a single
monolithic specification. This approach reflected the then-active XHTML specification, which
was split into modules for similar reasons.
The rationale for modularizing CSS was that each module could be worked on at its own pace,
and particularly critical (or popular) modules could be advanced along the World Wide Web
Consortium’s (W3C’s) progress track without being held up by others. Indeed, this has turned
out to be the case. By early 2012, three CSS Level 3 modules (along with CSS1 and CSS 2.1)
had reached full Recommendation status—CSS Color Level 3, CSS Namespaces, and Selectors
Level 3. At that same time, seven modules were at Candidate Recommendation status, and
several dozen others were in various stages of Working Draft-ness. Under the old approach,
colors, selectors, and namespaces would have had to wait for every other part of the specification
to be done or cut before they could be part of a completed specification. Thanks to
modularization, they didn’t have to wait.
So while we can’t really point to a single tome and say, “This is CSS,” we can talk of features by
the module name under which they are introduced. The flexibility permitted by modules more
than makes up for the semantic awkwardness they sometimes create. (If you want something
approximating a single monolithic specification, the CSS Working Group publishes yearly
“Snapshot” documents.)
With that established, we’re ready to start understanding CSS. Let’s start by covering the basics
of what goes inside a stylesheet.
剩余1596页未读，继续阅读
liucloris
- 粉丝: 0
- 资源: 20
我的内容管理
收起
- 我的资源
快来上传第一个资源
我的收益 登录查看自己的收益
我的积分
登录查看自己的积分
我的C币
登录后查看C币余额
我的收藏 
我的下载 
下载帮助
会员权益专享
最新资源
- GO婚礼设计创业计划：技术驱动的婚庆服务
- 微信行业发展现状及未来发展趋势分析
- 信息技术在教育中的融合与应用策略
- 微信小程序设计规范：友好、清晰的用户体验指南
- 联鼎医疗：三级甲等医院全面容灾备份方案设计
- 构建数据指标体系：电商、社区、金融APP案例分析
- 信息技术：六年级学生制作多媒体配乐古诗教程
- 六年级学生PowerPoint音乐动画实战：制作配乐古诗演示
- 信息技术教学设计：特点与策略
- Word中制作课程表：信息技术教学设计
- Word教学：制作课程表，掌握表格基础知识
- 信息技术教研活动年度总结与成果
- 香格里拉旅游网设计解读：机遇与挑战并存
- 助理电子商务师模拟试题：设计与技术详解
- 计算机网络技术专业教学资源库建设与深圳IT产业结合
- 微信小程序开发：网络与媒体API详解
资源上传下载、课程学习等过程中有任何疑问或建议，欢迎提出宝贵意见哦~我们会及时处理！
点击此处反馈
