absolute:将对象从文档流中拖出，运用left，right, 面向接口设计（Interface Oriented Design），top，bottom等属性举行绝对定位。而其层叠穿过z-index属性定义。
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在面向对象的分析和设计方法中，系统接口通常被视为契约。
In Object Oriented Analysis and Design Methodology, a system interface is most often viewed as a contract.
面向对象的设计专家建议我们对接口进行编程。
Object-oriented design experts advise us to program to interfaces.
在传统的面向对象(OO)设计中，通常让多个对象实例实现相同的接口。
In traditional Object-Oriented (OO) design, it is common to have multiple object instances that implement the same interface.
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