The RenderingContext interface represents the context of rendering that contains information required to present a renderable object.
RenderingContext接口表示呈现的上下文，包含表示可呈现对象所需要的信息。
The RenderingContext interface represents the context of rendering that contains information required to present a renderable object.
RenderingContext接口表示呈现的上下文，包含表示可呈现对象所需要的信息。
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