要查看几乎不可见的左侧框架的框架属性，则必须先使它可见。
To review the frame properties of the almost invisible left frame, you must first make it visible.
特别是，WAI-ARIA 提供了一个框架用于添加属性来识别用户交互的特点、它们互相如何关联以及它们的当前状态。
Specifically, WAI-ARIA provides a framework for adding attributes to identify features for user interaction, how they relate to each other, and their current states.
属性 ID 单独识别了转换框架的规则。
The ID attribute uniquely identifies the rule to the transformation framework.
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