Pseudo-element identifier
::first-line
Class identifier
Pseudo-class identifier
Attribute identifier
.warning
:hover
[type="checkbox"]
0,0,1,0
ID identifier #content 0,1,0,0
Inline style attribute style="color: red;" 1,0,0,0
Specificity values are cumulative; thus, a selector containing two element
identifiers and a class identifier (e.g., div.aside p) has a specificity of
0,0,1,2. Specificity values are sorted from right to left; thus, a selector
containing 11 element identifiers (0,0,0,11) has a lower specificity than a
selector containing just a single class identifier (0,0,1,0).
The !important directive gives a declaration more weight than nonimportant
declarations. The declaration retains the specificity of its selectors and is used
only in comparison with other important declarations.
Inheritance
The elements in a document form a treelike hierarchy, with the root element
at the top and the rest of the document structure spreading out below it
(which makes it look more like a tree root system, really). In an HTML
document, the html element is at the top of the tree, with the head and body
elements descending from it. The rest of the document structure descends
from those elements. In such a structure, elements lower down in the tree are
descendants of the ancestors, which are higher in the tree.
CSS uses the document tree for the mechanism of inheritance, in which a
style applied to an element is inherited by its descendants. For example, if the
body element is set to have a color of red, that value propagates down the
document tree to the elements that descend from the body element.
Inheritance is interrupted only by a conflicting style rule that applies directly
to an element. Inherited values have no specificity at all (which is not the
剩余306页未读，继续阅读
yinkaisheng-nj
- 粉丝: 762
- 资源: 6231
我的内容管理
展开
最新资源
- 十种常见电感线圈电感量计算公式详解
- 军用车辆：CAN总线的集成与优势
- CAN总线在汽车智能换档系统中的作用与实现
- CAN总线数据超载问题及解决策略
- 汽车车身系统CAN总线设计与应用
- SAP企业需求深度剖析：财务会计与供应链的关键流程与改进策略
- CAN总线在发动机电控系统中的通信设计实践
- Spring与iBATIS整合：快速开发与比较分析
- CAN总线驱动的整车管理系统硬件设计详解
- CAN总线通讯智能节点设计与实现
- DSP实现电动汽车CAN总线通讯技术
- CAN协议网关设计：自动位速率检测与互连
- Xcode免证书调试iPad程序开发指南
- 分布式数据库查询优化算法探讨
- Win7安装VC++6.0完全指南：解决兼容性与Office冲突
- MFC实现学生信息管理系统：登录与数据库操作
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
